introduce an internal URL for geoserver

refs opengeo/mapstory#579
Merge pull request #29 from opengeo/newMapSearch

Added a new AddLayer dialog plugin to GeoExplorer
fix undeclared variable use
handle invalid utf better and warn, refs #664
remove unused code
add uploaded file details to failure email
uploader, refs opengeo/mapstory#696

prefix numeral prefix with _ to prevent numbers getting wiped out
latest gxp see https://github.com/opengeo/mapstory/issues/616
latest OL
latest openlayers and gxp to implement https://github.com/opengeo/mapstory/issues/592
latest gxp to deal with https://github.com/opengeo/mapstory/issues/616#issuecomment-18551398
latest gxp to get improvement for tooltip time precision in time slider
latest gxp to get correct precision on time slider in interval mode
make use of subdomains and set tilesPerFrame to 24 as recommended by @ahocevar
do the Ext.isString check before we call charAt
collapseMode mini for the timeline panel in the composer
latest gxp: do not throw an error when a raster layer gets added to the composer
add a map copied signal, refs opengeo/mapstory#257
exclude annotation layers from sitemap
uploader - handle geoserver down better

refs mapstory/mapstory#732