Connection lifetime improvements, tls options fixes, and various bug fixes.

Updated mqtt connection to properly copy tls_options. (#62)

* Updated mqtt connection to properly copy tls_options.

* More bug fixes, noticed when tls_options were fixed.

Connect fixes

Fixes for connection hangs and crashes (#60)

* A connection which is already disconnected in shutdown should try to reconnect, because that means it was hung up on

* channel shutdown complete event must ALWAYS be called from channel shutdown callbacks

* If the socket was connected, go into the reconnect cycle

* Re-worked reconnect detection logic

* Ensure that on_connection_complete is called for the first completed connection, even if it's a reconnect

* documented connection_count

fixed C++ compatibility

v0.3.1

C++ compatibility fixes. (#59)

Automatic ping, and connection interuption detection. API compat breakage.

Automatic ping and interupt notification fixes. (#58)

* Automatic ping and interupt notification fixes.

Crash fix for requests sent while disconnected

v0.2.2

clear the hash table on disconnect, not clean_up (#56)

Improved cmake windows path handling.

Fixed cmake script and windows pathing. (#53)

* Fixed cmake script and windows pathing.

API updates to ease work on connection interuptions and resumption

v0.2.0

Always cleanup outstanding requests on destroy