Merge branch 'mchang/acceptance-testing' of https://github.com/MITx/mitx into mchang/acceptance-testing

updated accordion to iterate through chapters (weeks) and sections (problem sets, questions, etc) to test links

added accordion.feature and accordion.py, merged with mchang list and array creation for chapters and sections

Rewrote course adding and dropping to be able to handle a list of courses--to work it currently uses a hardcoded list with one course in it. In addition broke out utility methods into helpers.py. Withink helpers (and elsewhere where appropriate) created a local variable 'url' to allow for easy switching between sandbox and staging applications. As of commit, all 55 steps pass.

Merge branch 'mchang/acceptance-testing' of https://github.com/MITx/mitx into mchang/acceptance-testing

Kimth/progress hide

html escape errors