Change to landing page images, css.
Merge remote-tracking branch 'upstream/dev-branch' into dev-branch

* upstream/dev-branch:
  fixed tooltip alignment
  Fixed Suggested word sticks on search result page
  Hover states for resource icons - New design implemented
Merge pull request #1220 from anilgooru/dev-branch

Change to landing page images, css.
changed the search buttons css.
Merge branch 'dev-branch' of https://github.com/Gooru/Gooru-Web into dev-branch
Changes for mouse event handlers implemented on the header bar
Merge pull request #1221 from VinRudramurthy/dev-branch

changed the search buttons css.
Merge pull request #1222 from ssushma/dev-branch

Changes for mouse event handlers implemented on the header bar
Merge pull request #1223 from Gooru/dev-branch

Mouse hover issue on the header bar resolved