Generalised the tool selection for each column. Works very similar now to the search selection panel. Also added an extension point 'add_tool' to the column handler to allow each plugin to add a tool to the list through it's global.js file. This allowed me to move the 'create' tool for source edit to it's global.js file. Please note that the 'blur' to close the tool list doesn't work when using any of the 'blur' creating elements in the tool list (like selector, or input)
Added subtitles to all plugin renderer and also changed the icon for the wiki.
Merge branch 'master' of github.com:mytestbed/labwiki

Conflicts:
	lib/labwiki/theme/column_renderer.rb