Add colours in find-and-replace buttons

This will match the same colours used in SublimeText theme.
Add Sumolari fork changes

- Updated editor and gutter backgrounds
- Updated tab background
- Changed tips color to something lighter
- Updated fonts
Fix gutter, editor and tabs colors
Cleanup variables
Fix missing "ui-site-color" variables
Merge pull request #5 from am/match-sublime

Match Sublime colors
Merge pull request #6 from am/find-and-replace-buttons

Add colours in find-and-replace buttons