#156: basic style for the Performace panel(tabs specially).
#156 - Indent the first profile tab.
#156: Resolve merge conflicts.
#156- Fix tabs movement when selected/unselected. The background color of tabs bar meet firebug style, now.
Merge branch 'master' into issue156
Merge branch 'master' of https://github.com/firebug/firebug.next