Error: unknown decorator expression type: MemberExpression

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# Short summary of your issue
`Error: unknown decorator expression type: MemberExpression`
# Input data for reproducing
#### Configuration
```json
{
  "source": "./src",
  "destination": "./doc",
  "excludes": [
    ["\\.config\\.(js|es6)$"]
  ],
  "experimentalProposal": {
    "classProperties": true,
    "objectRestSpread": true,
    "decorators": true,
    "doExpressions": true,
    "functionBind": true,
    "asyncGenerators": true,
    "exportExtensions": true,
    "dynamicImport": true
  },
  "plugins": [{
    "name": "esdoc-standard-plugin"
  }]
}
```

#### Codes
```js
import { observable, action } from 'mobx'
import TransactionColumns from './transactionColumns'
import TransactionColumnsOptions from './transactionColumnsOptions'

export default class {
  @observable.ref transactionColumnsState = [
    'processing_timestamp',
    'core_transaction_id',
    'customer_name_given',
    'processing_result'
  ]
  @observable.ref transactionColumns = TransactionColumns(this.transactionColumnsState)
  @observable.ref transactionColumnsOptions = TransactionColumnsOptions(this.transactionColumns)
  @observable.ref filtered = [{
    id: 'processing_result',
    value: ''
  }]
  @action.bound
  setFiltered (data) {
    this.filtered = data
  }
  @action.bound
  setTransactionsColumnsState (data) {
    this.transactionColumnsState = data
    this.transactionColumns = TransactionColumns(this.transactionColumnsState)
    this.transactionColumnsOptions = TransactionColumnsOptions(this.transactionColumns)
  }
}
```

# Output data
#### Log
```
error: could not process the following code.
/Users/khaiphan/Documents/Projects/nfq/alice/src/containers/Transactions/model/transaction.js
0| undefined
1| import { observable, action } from 'mobx'
2| import TransactionColumns from './transactionColumns'
3| import TransactionColumnsOptions from './transactionColumnsOptions'
4|
5| export default class {
6|   @observable.ref transactionColumnsState = [

/Users/khaiphan/Documents/Projects/nfq/alice/node_modules/esdoc/out/src/ESDoc.js:303
        throw e;
        ^

Error: unknown decorator expression type: MemberExpression
    at ClassPropertyDoc._$decorator (/Users/khaiphan/Documents/Projects/nfq/alice/node_modules/esdoc/out/src/Doc/AbstractDoc.js:578:17)
    at ClassPropertyDoc._apply (/Users/khaiphan/Documents/Projects/nfq/alice/node_modules/esdoc/out/src/Doc/AbstractDoc.js:106:10)
    at ClassPropertyDoc._apply (/Users/khaiphan/Documents/Projects/nfq/alice/node_modules/esdoc/out/src/Doc/ClassPropertyDoc.js:30:11)
    at ClassPropertyDoc.AbstractDoc (/Users/khaiphan/Documents/Projects/nfq/alice/node_modules/esdoc/out/src/Doc/AbstractDoc.js:56:10)
    at ClassPropertyDoc (/Users/khaiphan/Documents/Projects/nfq/alice/node_modules/esdoc/out/src/Doc/ClassPropertyDoc.js:24:1)
    at DocFactory._createDoc (/Users/khaiphan/Documents/Projects/nfq/alice/node_modules/esdoc/out/src/Factory/DocFactory.js:455:12)
    at DocFactory._traverseComments (/Users/khaiphan/Documents/Projects/nfq/alice/node_modules/esdoc/out/src/Factory/DocFactory.js:396:20)
    at DocFactory.push (/Users/khaiphan/Documents/Projects/nfq/alice/node_modules/esdoc/out/src/Factory/DocFactory.js:349:20)
    at _ASTUtil2.default.traverse (/Users/khaiphan/Documents/Projects/nfq/alice/node_modules/esdoc/out/src/ESDoc.js:300:17)
    at enter (/Users/khaiphan/Documents/Projects/nfq/alice/node_modules/esdoc/out/src/Util/ASTUtil.js:39:9)
```

#### Screen shot of documentation
// attach a image into here

# Exception output (if possible)
#### Log
```
error: could not process the following code.
```

#### Screen shot of documentation
![Image](https://i.imgur.com/eNlEFqg.png)

# Your environment
- OS type and version: OSX Sierra v10.12
- Node.js version: 8
- ESDoc version: 0.5.2


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Error: unknown decorator expression type: MemberExpression #439

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Error: unknown decorator expression type: MemberExpression #439

Description

Short summary of your issue

Input data for reproducing

Configuration

Codes

Output data

Log

Screen shot of documentation

Exception output (if possible)

Log

Screen shot of documentation

Your environment

Metadata

Metadata

Assignees

Labels

Type

Projects

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Development

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