Initial addition of PutRecords API
Begin documenting PutRecords
PutRecords: Update from beta API
Document PutRecords data fields
Version bump to 0.1.2
Consistent record type formatting
Update constraints file
Update CHANGELOG
Merge pull request #2 from jonsterling/put-records

Support PutRecords API
GetShardIterator: Fix StartingSequenceNumber in ToJSON instance
Message key may be missing
Add note on GetShardIterator to changelog