Fix gsm layout based on measured SIM900 module size.

U1 and C5 would be very close to the module so I relaid it out in
order to maximize the distance between the SIM900 and those two
components.  Also, C5 was swapped for a smaller tantalum capacitor
since the ripple current was calculated too conservatively last time.
Update project file to Eagle 6.5.0
Merge pull request #46 from timburke/dev

Update gsm_module with tweaked layout for optimized part spacing