provide postgis as dbtype for datastore

fix for #1658
upload - log unexpected exceptions

fix for #1659
Merge pull request #1660 from ischneider/iss-1658-1659

Fixes for 1658 and 1659
announcements as template include fragment

and check for dismissal_type when rendering template
Merge pull request #1682 from ischneider/announcements-include

announcements as template include fragment
Fix issue with float to decimal conversion in arcgis layer registration in Python 2.6
Merge branch 'master' of https://github.com/GeoNode/geonode
Merge branch 'remoteservices_decimal_fix' into ogc_service_getccaps_links_test