Add info alert on WinXP
Detect WinXP, old OS X, Debian 7 and old Ubuntu
Style changes
Merge remote-tracking branch 'upstream/master' into xp-alert

Conflicts:
	css/brackets.io.css
Merge pull request #96 from MarcelGerber/xp-alert

Add info alert on WinXP
Merge remote-tracking branch 'upstream/master' into new-features-localized

Conflicts:
	index.html