Added MavLinkLogger stub; Formatting and style.
Checkpoint for MavlinkLogger work
Revert change include change to MavLinkPacketHandler that broke everthing
Use correct path to create test log file

- Successfully replayed tlog file from iGCS
  in qgroundcontrol app
log time format almost works..
Change queue name for MavLinkLogger class
Added DateTimeUtils

- DRY up MavLinkLogger
Better method names in DateTimeUtils

- Fix typos as well
- Move docs to header
Merge branch 'master' into igcs-55-telemetry-loggers
Set up Mavlink Logger on rx of data
Remove unused _writeBuffer from MavLinkLogger
Fix typos and horrible math mistake
DRYup DateTimeUtils; Add GMT format to log files.

- added dateStringWithTimeZone: to DateTimeUtils
  that return a dateString in the format
  yyyy-MM-dd-HHmmssZZZZZ where ZZZZZ is for
  RFC 822 GMT format e.g  +0000 or -0800
Format string was not update for RFC 822

- note on precision of unixTimeInMicroseconds:
Removed broken mach_absolute_time based time method