add support for own ids (coalescing)

Fix two race conditions in client.Do

* Common race condition is fixed by identifying that Client.respHandler
  can be completely removed since all respHandler operations (get, put
  and invocation) can be moved into the Client.processLoop goroutine,
  meaning that zero locking is required. This race condition resulted
  in a deadlock that was resolved by the response timeout at the
  end of client.Do, returning ErrLostConn

* Rare race condition is fixed by changing responseHandlerMap.get
  to .getAndRemove. This race condition resulted in the innerHandler
  for a new dtJobCreated assigned in client.Do overriding a stale older
  dtJobCreated request, and the newer innerHandler being removed by an
  older dtJobCreated in client.processLoop > client.handleInner. When
  the newer dtJobCreated response was received, the handler for it had
  already been deleted. This was resolved by the response timeout at the
  end of client.Do, returning ErrLostConn

* add synchronization to prevent race condition on worker shutdown

* fix incorrect synchronization and add race unit test

* fix race while broadcasting outpack

Fix function comments based on best practices from Effective Go

Signed-off-by: CodeLingo Bot <bot@codelingo.io>

Fixed issue where timeout is sent as binary encoded uint but server
expects a string

Ref - https://github.com/appscode/g2/issues/28

* fix worker reconnect errors, send cando after reconnection.

Fix race condition in client.Do()

Fixes duplicated code after merge

OS and configuration specific integration test

Run integration tests with the -integration flag

fixed typo on WorkComplete

Add lock on job handler assignment

Fixes race condition on jobs being done before handler is set.

Add sync lock to create job functions

Add sync lock to make create job calls thread safe.

concurrent map bug fixed #70

fixed #65

Allow built in selectionHandlers to be reused outside of package

Export SelectionHandler

Replace mutex in client.do() with a channel to avoid deadlock and int…

Updated to reflect new type names.