changed links for testing

Changed links for testing; actual URLs may differ in final version.

another link update

Updated header logo

shrunk logo down

Second group of fixes for landing page integration.

Second set of landing page integration changes.

fixed footer link to read 'survey'.

Removed superfluous base page; used blocks to remove small logo from main page; recompiled scss per line comment.
adds codalab-cli and fabric requirements
adds missing newline
Merge branch 'doc'
Clean-up formatting and remove commented code.
Fix menu highlight for home page.
Remove unnecessary code.
Merge pull request #449 from cpoulain/master

Remove unnecessary code.
Merge branch 'feature/fix-requirements' of https://github.com/Tivix/codalab into review
Merge branch 'review'
Merge branch 'master' of https://github.com/codalab/codalab
merge master