Support for ArcGIS REST layers
Add a dropdown to NewSourceDialog for selecting between source types (WMS, ArcGIS REST).
Clean up a few lines
Tweak text
fix typo
Merge branch 'master' of https://github.com/opengeo/gxp into arcgis_rest
Merge pull request #193 from cga-harvard/arcgis_rest

Display ArcGIS REST layers