Updated Simplified Chinese translation.
Fix Russian localization
Updated Greek localization
Fixed my own mistakes
Add feature: Press space to rotate overlapping hints

Also noted the feature in the help dialog.

And while cleaning up the added code in marker.coffee, I couldn't stop
myself from cleaning up the rest of the code there a bit, too.
Closes #168 -- for real this time

Commit bc315d9 made changes to the CSS of VimFx:

1. It changed from "agent" sheets to "author" sheets
2. It removed all `!important`

That caused problems with userstyles in userContent.css or Stylish.
Website themes installed by the user often make the hint markers
unreadable, for example.

Commit 21a09a1 reverted #2.

After a while, though, I noticed that it wasn't enough, unfortunately.

This commit reverts #1, and adds a comment about it.
Merge pull request #179 from lydell/userstyles-fix

Closes #168 -- for real this time
Merge pull request #171 from mozillazg/zh-CN

Update Simplified Chinese translation
Merge pull request #172 from harius/ru

Fix Russian localization
Merge pull request #173 from sirodoht/develop

Updated Greek localization
Merge branch 'develop' into hints-overlap-fix

Conflicts:
	extension/locale/ru/vimfx.properties
Move `z-index` out of `.VimFxReset`

The hint markers need to set `z-index` dynamically (to rotate overlapping
markers). style.css is inserted as an agent sheet and uses `!important`
everywhere (this is needed to override userstyles, see commit 6145382),
and can therefore not be overrided by inline styles.

Therefore, I've moved `z-index` out of `.VimFxReset`, to each place that
actually _needs_ it: A few positioned elements.
Fix: Overlapping hints rotation was mostly broken
Make marker border more prominent
Merge branch 'hints-overlap-fix' of git://github.com/lydell/VimFx into lydell-hints-overlap-fix
Enabled Shift-space to rotate hint markers backwards
Small code tweak
Code Review
Merge pull request #1 from akhodakivskiy/lydell-hints-overlap-fix

Enable forward/back marker rotation
Merge pull request #178 from lydell/hints-overlap-fix

Add feature: Press space to rotate overlapping hints