add propagate_reply to PP parser
add propagate_reply to XS parser
add on_disconnect callback
bump version 2.13_1
handle connection errors using on_disconnect callback
update raise_error documentation
comment out send_command_cb documentation
improve documentation for mainloop and get_all_replies
fix ERROR HANDLING pod section
bump version 2.13_2
reset object before throwing exception

this allow to use object after exception without any additional actions
call on_disconnect on connection errors

instead of confessing. Now there are less cases there object can not be used after exception
bump version 2.13_3
fix on_disconnect when raise_error is undef
turn _on_disconnect into internal callback
remove pause in test
handle disconnects when in subscription mode
move existing transaction test into subtest
do not stringify exception
transactions support in no raise_error mode