Merge pull request #2048 from anilgooru/release-6.6.3.a1

Fixed issue with prepopulated email id for checking user name already exits.
course deleting if change tabs from info to other.
My Collections: Issue rctified with scroll bar.
Merge branch 'release-6.6.3.a1' of https://github.com/Gooru/Gooru-Web into release-6.6.3.a1
Merge pull request #2049 from shivalinga/release-6.6.3.a1

course deleting if change tabs from info to other.
Merge pull request #2050 from VinRudramurthy/release-6.6.3.a1

My Collections: Issue rctified with scroll bar.
Partially implemented: 1.0.b www [System - pwd] Login not working for Gooru Tutorials account, pwd has special character: &
Merge remote-tracking branch 'upstream/release-6.6.3.a1' into release-6.6.3.a1

* upstream/release-6.6.3.a1:
  My Collections: Issue rctified with scroll bar.
  course deleting if change tabs from info to other.