Merge pull request #1363 from minrk/qtstyle Fix some minor color/style config issues in the qtconsole The tabbed code changed a few things about loading styles and stylesheets in the qtconsole, which this resolves, among a couple other small color-related issues: * tabs other than the first get colors * IPythonWidget.style_sheet configurable is not clobbered by defaults * style_sheet configurable would cause a crash, because _style_sheet_changed could be called before _control existed * fix str->unicode token preventing stylesheets without syntax highlighting from working * fix typo in the function used to detect whether a bgcolor is dark or light