Update 10-15-14: Mutexes, Project Browsing, Data Set Fails

- mutex included to lock the dataPoints array to prevent crash from enumerating the array (i.e. saving it) while recording data
- fixed project browser's silly 1-second delay simply because the dispatch queue was used incorrectly
- fixed project browser for iPad so that users can actually select a  project by commenting out a piece of iPad-specific code.  Going to leave this as-is since the project browser will likely be re-written post-release
- data that cannot be formatted for upload is properly indicated as an error