Project organization
Added core file structure
Add Dropbox framework v3.1.1 and requirements:
- Dropbox (v3.1.1)
- CFNetwork
- Security
- SystemConfiguration
- QuartzCore
- libc++
- libz
Added URL schema for Dropbox API (db-vdquczrlmespiuy)
Switched deployment target to iOS 7.0.  Fixed issue with developer account.