merge in missing stuff from the mapstory branch, now that this development has settled down
fix some issues with BC dates in the extended date/time field
Check for the filters property before using

In the GeoNOde Catalog Source filter method the filters property
should be an optional argument. This commit checks to make sure it
exits before using it. Should not change existing functionality.
Remove extra space
Merge pull request #179 from iwillig/fixFilterMethod

Check for the filters property before using
Merge branch 'master' of https://github.com/opengeo/gxp into devfeed2
jslint fixes for @bartvde