Fixing various UI bugs including:

- make sure text isn't selected when using multiple series in row evolution popups
- tweak position/height of site selector label
- make sure export as image dialog has border
- fix css bug in morpheus having to do w/ dialog buttons (background was erased on hover)
Make sure plugin name + version appear on same line in plugin/theme listing.
Override users table's token auth cell color in morpheus.
Merge branch 'master' of https://github.com/piwik/piwik