Carview!

fixes "Failed to load locked problem" issue.
move plugin's data into separate folders:
- login info
- problems list
- problem cache

add session command to manage coding sessions on leetcode.com.
add more color themes.
- molokai
- solarized
- solarized.light
list
- fix id mismatch issue.
show
- add -o option to specify output folder.
- fix badge output in non-default color themes.+
stat
- calculate on AC-ed questions in calendar graph.
test
- fix out-of-order output issue.

only supports node's version >= 4.
Refactor folder structure:
- now ~/.lc/ would be the only folder used by leetcode-cli.
- move lcconfig file to ~/.lc/.
- move cache files to ~/.lc/cache/.
config
- fix string value parsing error.
list
- show tag/lang badges in -x output.
show
- add -q -t options to filter random questions.
stat
- enhance output of -g option.
- enhance output on windows.
- add -c option to display calendar stat of how many AC-ed questions per day.
- add --no-lock option to filter out locked questions.
- add -q -t options to filter questions stat.

plugin
- only install necessary depedencies on specific platform.
- add -c option to show plugin config.
- support cookie.chrome plugin.
- supportcookie.firefox plugin.
docker
- support running leetcode-cli as docker container for new user's tasting.
- auto build docker image in Docker Hub.
UI
- Add spinner message for long time running works.
Add logo and updte documents.

Releases: skygragon/leetcode-cli