Added User-Agent in all Gooru API's Request Header
Null pointer exception has been handled.
Changes for Search filters for pre-selecting rating OER and Mobile Friendly filter.
Fixed : (IE) - In +New Resource the upload URL button and refresh icons are messed up.
Merge remote-tracking branch 'upstream/release-6.6.3.a1' into release-6.6.3.a1

* upstream/release-6.6.3.a1:
  "adding the title in the ui.xml"
Merge pull request #2399 from anilgooru/release-6.6.3.a1

Fixed : (IE) - In +New Resource the upload URL button and refresh icons are messed up.
Merge pull request #2398 from VinRudramurthy/release-6.6.3.a1

My collections: made invisible default advanced text if all advanced options made open.
Merge pull request #2400 from shivalinga/release-6.6.3.a1

Added User-Agent in all Gooru API's Request Header
Course tooltip stuck issue resolved and partially done resource text issue fixed
Merge branch 'release-6.6.3.a1' of https://github.com/Gooru/Gooru-Web into release-6.6.3.a1
"Changing the url value ,it should be {collectionid}.json"
Merge remote-tracking branch 'upstream/release-6.6.3.a1' into release-6.6.3.a1
Prefilter popup scroll issue on firefox resolved
conflicts resolved - Prefilter popup scroll issue on firefox resolved
"In edit question resource popup question title is not displaying in FF Fixed."
"For +New Resource from file there is no validation to select the resource format Fixed."
"Resource format validation overlapping issue fixed."
Merge remote-tracking branch 'upstream/release-6.6.3.a1' into release-6.6.3.a1
Merge pull request #2406 from sravanthi1/release-6.6.3.a1

"In edit question resource popup question title is not displaying in FF Fixed"
Merge pull request #2402 from mitraj/release-6.6.3.a1

Course tooltip stuck issue resolved and partially done resource text issue fixed.