Initial pass at getting repository information displaying in a panel.

Also changed the FeatureEditorGrid to get rid of tabs and replaced them with spaces. Changed the east panel to have a tab panel.
Improved some of the code for the show/hide history button based on comments from Bart's code review.
Merge commit '50a4a3c2a4cf6d4a29b59ab66b00bbb56901572e'
Fixed a bug related to the external node.

We were checking for the first index of 'geoserver' when we should be checking for 'geoserver/' because the external node url includes geoserver in it.