Backup: Refactores Transport::ConnectToBootstrapEndpoint

A bit
Adds OnConnect functor to Connection class
Backup: AddConnection is now called from OnConnect handler
Connection on_connect handler gets called even if connection fails

With an error as a parameter.
Cleaning up debug output
A bit more cleanup
Should fix data race inside ConnectionManager::Connect

As reported by TSan:
http://dash.maidsafe.net/testDetails.php?test=2619577&build=71515
Merge pull request #35 from inetic/MAID-286-Assertion_inside_ConnectToBootstrapEndpoint

Maid 286 assertion inside connect to bootstrap endpoint
Fixes invalid read in FUNC_API_ParallelReceive
Now uses weak_ptr inside the AsyncDispatch handler

As opposed to shared_ptr. This is so that the handler
won't keep Transport from being destroyed.

Though, keeping the Trasport from being destroyed may be
what was intended, it will need to be done in different
way as this was blocking the asio::io_service::run from ever
finishing.
Merge pull request #39 from inetic/MAID-292-fixes-invalid-read-and-a-hanging-issue

Maid 292 fixes invalid read and a hanging issue
Merge pull request #38 from inetic/MAID-370-data-race-in-ConnectionManager-Connect

Should fix data race inside ConnectionManager::Connect