removed unwanted lines.

removed unwanted lines.
Comments added for Ratings in server package.
NGSS standards preferences implemented in the user settings page
resolved conflicts
Merge pull request #19 from VinRudramurthy/release-6.1.5

Comments added for Ratings in server package.
Merge pull request #20 from nutan-gooru/release-6.2

Release 6.2
Hiding TEKS standards library for logged out users implemented
Merge pull request #21 from chandrasekharv/release-6.2

Hiding TEKS standards library for logged out users implemented
Merge remote-tracking branch 'upstream/release-6.2' into release-6.2
"The Class drop down list should stick to teach tab issue resolved."