Added new error do object.
On logout removed cookies.
Integrated Google Drive Api and handled error validation.
Merge remote-tracking branch 'upstream/dev-branch' into dev-branch

* upstream/dev-branch:
  Listing google drive root files and child files has been implemented.
  Fixed  [Player - Text] Under More Info Gooru Course is missing a ":" + space
  Fixed  https: Image file is not supported, 404 status showing in player
  "[I18N]compilation error resolved"
  Standard libray API has been reverted to old API.
  Removed text changes for flagging
  Hover state removed for 'Drag To Add'
  Text Changes

Conflicts:
	src/main/java/org/ednovo/gooru/client/mvp/shelf/collection/tab/resource/add/drive/DrivePresenter.java
	src/main/java/org/ednovo/gooru/client/mvp/shelf/collection/tab/resource/add/drive/DriveView.java
	src/main/java/org/ednovo/gooru/server/service/ResourceServiceImpl.java
Merge pull request #832 from anilgooru/dev-branch

Added new error do object. On logout removed cookies. Integrated Google Drive Api and handled error validation.