Display message for unsupported variables
Remove bin directory
Remove unused files
Update default builder
Implement commands
Bump version to 2.0
Fix bug
Remove message
Update doc
Update README
Refactor some files
Using vimproc
Improve generator
Define source
Implemented AlpacaTagsProcessStatus
Checks timeout process
Fixed README
Merge branch 'v2.0'

Conflicts:
  README.md
  autoload/alpaca_tags.vim
  autoload/alpaca_tags/create_tags.vim
  autoload/alpaca_tags/util.vim
  autoload/alpaca_tags/variables.vim
  autoload/vital/alpaca_tags.vital
  bin/create_bundle_tags_into_git
  bin/create_tags_into_git
  plugin/alpaca_tags.vim