Add more datetime conversion functions. Cleanup
Refine encoding handling. Add support for integer values
Add NowSMS client
Split long multipart message to parts
Add part_ref_num to part
Prettify tests
Don't store part_ref_num, part_seq_num, parts_total for regular message
Standardize send_mt_msgs and send_mo_msgs a bit
Don't store message's reference number when the message comes concatenated
Refactor message part data structure
Store atom in binary
Store atom in binary