modified send_data_address() to span

s/datacoin/florincoin/

Updated test cases

Even more tests

tx-comment fragmentation feature

Tests passing for py27, py34

Fixed bug when syncing.

Fixed a failure when tx-comment is not present for the transaction.

New version, changes are backwards-incompatible

Updated docs, cosmetic
Merge branch 'master' of https://github.com/androm3da/metachains-dtc