Merge pull request #20 from bosqueviejo/master

sync_send and bugfixes
Merge pull request #22 from bosqueviejo/master

0.12.0 - Multiconnections
Merge pull request #23 from bosqueviejo/master

bugfix
Merge pull request #24 from altenwald/master

Select Route to Send Stanzas
Update covertool version with race condition fix