Fixed 80 chars marker does not appear in Firefox.
Fixed loss of important patch/diff aspects and too aggressive diff coloring.

- Contextual diff lines (preceding/following lines of changed lines) are crucial, must not visually appear as unimportant, greyed-out content.
- Restore colorization of comments in added lines for readability and to encourage code comments.
- Generally decrease background color saturation to shift focus on code, instead of colors.
Merge branch 'diff-coloring' into sun
Merge branch '80chars-marker-firefox' into sun

Conflicts:
	src/less/dreditor.less
Fixed placement/position of image embed buttons.
Merge pull request #102 from sun/image-embed-button-placement

Fixed placement/position of image embed buttons.
Merge pull request #100 from sun/grunt-watch-dev

Added task/target 'dev' to speed up rebuild via 'grunt watch:dev' for live debugging.
Merge pull request #98 from sun/duplicate-review-buttons

Fixed patch review buttons are duplicating themselves on every invocation.
Merge remote-tracking branch 'remotes/origin/1.x' into sun