Various changes to the styling of the data source browser.
Move the add buttons to the toolbar.
Merge branch 'dataSourceBrowser' into styleDataSourceBrowser
Merge remote-tracking branch 'origin/dataSourceBrowser' into styleDataSourceBrowser
Merge branch 'dataSourceBrowser' into styleDataSourceBrowser
Merge branch 'dataSourceBrowser' into styleDataSourceBrowser
Made cesium-dataSourceBrowser-button identical to cesium-widget-button.
Some mods to the list of items in dataSourceBrowser.
Added class for selected item.
Merge branch 'dataSourceBrowser' into styleDataSourceBrowser
Merge branch 'dataSourceBrowser' into styleDataSourceBrowser
Add a gallery-index for Cesium Viewer.
Limit the height of the active data source panel container.
Increase width.
Merge branch 'dataSourceBrowser' into styleDataSourceBrowser
Set the max height from the viewer widget.
Move maxHeight into viewModel, get rid of float.
Make height offset a parameter.
Merge pull request #1057 from AnalyticalGraphicsInc/styleDataSourceBrowser

Style data source browser