Fix repeated doc builds
Make builds quiet by default
Add verbose option
Fix import mocks.

    Prevents sphinx from bailing on builds that involve unavailable imports.
Change registration button based on number of modes.
Add new column to CourseMode table for currencies
Add in tests for the marketing site button.
small change in aggregating peer eval grades (rounds up)
Wrote preliminary help modal acceptance tests
updated styling for marketing side register button to accommodate second line of text
Fixed wording to better reflect BDD specs
Made filling field a bit safer
Tightened up wording
updated styling for marketing side register button to accommodate second line of text - and IE-specific styling
Add in a uniqueness constraint on mode, course, and currency.
Stylistic change and factored out method to common
Merge pull request #496 from edx/feature/cdodge/add-a-mixed-modulestore

Add a 'MixedModuleStore' which aggregates between XML and Mongo Modulestores
Remove 'edu' from examples

per our agreement not to use the domain
Location to Locator mapping utilities

partial impl
pep8 violation fix (shadowed identifier)