release: v0.7.0

Merge branch 'master' into develop
* master:

Merge branch 'develop'
* develop:
  chore: prepare to release v0.5.1
  docs: improve documents
  fix(is_exported): Skip testing uninitialized exported variable for bash 4.0~4.3
  docs: update module usages && improve documents
  test(is_exports): add export-but-uninitialized test case
  fix(is_exported): it should be false if local variable is associate array but its name contains x
  test(is_array): Skip testing uninitialized variable for bash 4.3
  fix(is_array): exported array should be true
  docs: improve documents && Chinese documents

Merge branch 'develop'
* develop: (87 commits)
  docs: update CHANGELOG
  test(is_ubuntu): fix for CI
  ci: add cmd for local workflow
  ci: fix test-in-docker
  ci: fix PUBLIC_DEPTH=2 when $PREFIX != l.
  ci: test.dockerfile should install git
  ci: use -d option instead of BUILD_DIST for tools/test-in-docker
  fix(random): l.random hangs up in Github Action
  fix: PUBLIC_CONST_PREFIX
  refactor: improve _LOBASH_OS && remove redundant newline
  docs: update module-docs
  fix(with_ifs): eval "$@" -> eval "$*"
  fix(sleep): do not create _L_SLEEP_TEMP when loading lobash
  ci: fix for test -d with different prefix
  fix(build): remove public method wrappers && internal variables should be replaced when building
  fix(ci): load_module should load dist/lobash.bash
  feat(build): reuse the last UNIQ_KEY if found
  refactor(meta): refactor and add test cases for _lobash.semver_compare
  ci: update test1
  fix(build): format command comment
  ...

v0.4.0
See [changelog](https://github.com/adoyle-h/lobash/blob/master/CHANGELOG.md)

See ChangeLog
https://github.com/adoyle-h/lobash/blob/develop/CHANGELOG.md#v031---2019-07-08-022200-0800

See Change Log: https://github.com/adoyle-h/lobash/blob/develop/CHANG…
…ELOG.md#v030---2019-07-08-011600-0800

Merge branch 'develop'
* develop: (140 commits)
  fix(test): count_lines
  update(example/trim): update output
  remove(count_lines): l.count_lines arguments not work
  fix(trace_stack): stack shoule exclude trace_stack function name
  fix(choose): use read command to display prompt text
  docs: update README
  update: travis and readme
  rm: src/modules/relative.bash
  fix(consts): _LOBASH_PREFIX can be reassigned
  update: License
  update: support Zsh is cancelled
  docs: update README
  docs: update docs
  update(zsh): scaffold zsh test environment
  refactor(str_len): rename variables
  fix(str_size): It not work with double-width characters when environment LANG is not UTF-8.
  fix(sleep): the lower bound of sleep time should be 50ms
  fix(now): to be compatible with Mac/Linux/BusyBox systems
  refactor: adjust module categories
  update: update modules usages && fix missing argument should not throw error in some modules
  ...