clippyが相対URLに対応していないのを修正
同名ファイルへのリンクが相対URLに対応していないのを修正
Merge pull request #49 from nicklegr/develop

一部の箇所が相対URLに対応していないのを修正
Remove ignored files with update
Faster DocumentTable#remove_records
typo
Delete auto search feature 'w:0' and 'fp:a b'

Led to user confusion
Add Updater#set_global_gitignore
Create 'milk ignore --global' mock
Add methods YamlFileWrapper, MilkodeYaml#global_ignore, set_global_gitignore
Read & Write global_gitignore on 'milk ignore --global'
Not raise exception when file not exist
Merge branch 'feature/global-gitignore' into develop
Not remove package non exist filename

Before:
  $ milk pwd
  milkode in /path/to/package
  $ milk remove jkjkjk               # A illegal package name
  rm_package : /path/to/package      # Oh...

After:
  $ milk remove jkjkjk               # A illegal package name
  Not found package 'jkjkjk.         # Correct!
Add milk cleanup options. -p, -a
Support 'milk cleanup PACKAGE_NAME'
Correct test
Add Util#highlight_keywords
Hightlight filename keywords
Remove private

Can't call highlight_keywords_sub ...