Studio: adds a space back to the phrase 'Welcome to edX Studio' that went missing
Studio: revises spacing fix for welcome to edX studio title
Correctly persist checklist settings.

Incidentally, fixes an acceptance test (which would have caught this
bug) not running. Its step regex was "They are correctly selected
after I reload the page$", which happens to be matched by "I reload
the page$", another step definition. Lettuce seems to arbitrarily pick
between definitions if they both match a step, so it's good to ensure
that each step isn't a sub-regexes of another.
Merge pull request #465 from edx/peter-fogg/fix-stud-485

Correctly persist checklist settings.
Merge pull request #447 from edx/talbs/studio-fix-title

Studio: adds a space back to the phrase 'Welcome to edX Studio'
Fix pylint violations, reorder imports
Merge branch 'master' of github.com:edx/edx-platform into feature/kluo/bulk-email