Code review comment for lp://qastaging/~barcc/acire/style2

This branch makes the GTKSourceView looks like in Gedit. This is good for users who use different themes and styles.

GTKSourceView supports different style schemes to color the text. Acire should support this too and a simple way is to look which scheme gedit uses. In GConf-key "/apps/gedit-2/preferences/editor/colors/scheme" Gedit stores the id of a GtkSourceView Style Scheme used to color the text. This branch uses this id to select a color style scheme at initializing acire.

Another solution would be to add a menu "View->Color Style Schemes->..." and a gconf key to let acire select and store its own choice.