v1.2.1

Exif updates

Features:
Add support for descriptions
Add support get getting width/height
Add support for speed/altitude from location
Add support for lastModifiedTimestamp

Bugfixes:
Save/parse time in local time
Support millis in timestamps (except for location)
Remove calls to @hide methods on ExifInterface
Use TAG_DATETIME for last modified and DATETIME_ORIGINAL for photo taken
timestamp
Attach TAG_DATETIME_DIGITIZED too, since we're using a digital camera