Merge pull request #15 from vinceyuan/master

Removed the unnecessary gutter color which invalidates other colors, such as atom-jshint-error (added by atom-jshint package).
Use syntax variables
Style search result markers

Closes #14
:lipstick: Nest .cursor-line rule under .guttter
Prepare 0.6.0 release
Add some initial markdown styles

Closes #13
Prepare 0.7.0 release