Search profile for new Data.gov catalog

This search profile enables searching the new Data.gov catalog.
DCAT support for previous Geoportal Server releases

this patch enables DCAT listing of the catalog in Geoportal Server
1.1.1, 1.2.0 and 1.2.2. See readme.txt for more details.
Merge branch 'develop'
Update readme.txt

updated with further info for applying dcat customization
Update readme.txt

updated to answer questions about ISO support for this customization (answer = "Yes!").
Update readme.txt

included note about gpt.properties settings for default DCAT JSON response
cached JSON file changes for 1.2.2

changes to support cached JSON file
Merge branch 'master' of https://github.com/Esri/geoportal-server
updated to include instructions for scheduled cached JSON file

updated to include instructions for scheduled cached JSON file
update download language
Add CONTRIBUTING.md
readme updates
minor updates
Merge branch 'master' into mydevelop2
Merge branch 'master' into mydevelop2