Issue 206 Removed BuildHelper tab completely

Goal: Achieve consistent UI amongst all project pages. Only the OH project page has this BuildHelper tab.

This task will be a 3-step code removal process:
1. remove the front-end html/css
2. do a south migration to deletes any buildhelper data
3. finally, remove any .py files in the models and views that mention the buildhelper.

This commit achieves the first step.