Merge remote-tracking branch 'upstream/release-6.2' into release-6.2

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Fixed Stories:
1.Added support to add Multiple answers question as resource.
2.Added support to play Multiple answers question in player.
Navigation confirmation functionality partilay impletmented
Merge branch 'master' of https://github.com/shivalinga/Gooru-Web into release-6.1.5
Merge branch 'release-6.2' of https://github.com/Gooru/Gooru-Web into release-6.1.5
"[Search - OER] We should have a resource filter for OER resources"
Added new arrow image for Primary and secondary information toggle feature.
UI design integrated for the new Collection Edit metadata fields
UI design integrated for the new Collection Edit metadata fields - Toggle Arrow image handled, on different scenarios to navigate back and forth.
Teacher Tip Functionality added under Share tab
Merge pull request #22 from mitraj/release-6.2

"[Search - OER] We should have a resource filter for OER resources"
Merge pull request #23 from ssushma/release-6.2

UI design integrated for the new collection info meta data fields.
Display question count for each collection in the collection-search results
Merge pull request #24 from chandrasekharv/release-6.2

Display question count for each collection in the collection-search results
Implemented Navigation confirmation popup:
when user navigation the resource with out submiting the answers
this popup will dispaly.
Implemented create star ratings for the resources.
Resolved the merge confilcts.
Merge pull request #25 from shivalinga/master

MA Question type and Navigation confirmation popup
Merge branch 'release-6.2' of https://github.com/Gooru/Gooru-Web into release-6.2

Conflicts:

src/main/java/org/ednovo/gooru/client/mvp/play/resource/body/ResourcePlayerMetadataUiHandlers.java

src/main/java/org/ednovo/gooru/client/mvp/play/resource/body/ResourcePlayerMetadataView.java

src/main/java/org/ednovo/gooru/client/mvp/shelf/collection/Collection.css

src/main/java/org/ednovo/gooru/client/mvp/shelf/collection/CollectionCBundle.java

src/main/java/org/ednovo/gooru/client/mvp/shelf/collection/tab/info/CollectionInfoTabView.java

src/main/java/org/ednovo/gooru/client/mvp/shelf/collection/tab/info/CollectionInfoTabView.ui.xml

src/main/java/org/ednovo/gooru/shared/util/MessageProperties.java
Merge pull request #27 from VinRudramurthy/release-6.1.5

Created user ratings, functionality.