Minor improvements (see desc)

* renamed requestsManager:didStartRequest to requestsManager:didScheduledRequest:
* improved clarity of synthesized variables
* code conventions
Added didCompleteQueue delegate method call
Added didCompleteQueue delegate method to Protocol
Added remainingRequests method to protocol
Added remainingRequests method to RequestManager.m
Merge pull request #6 from pk1986/master

Added delegate method for queue completion and exposed the number of remaining requests.
Code conventions, updated project to remove warnings.
Update README.md
solved BAD_EXEC_ACCESS on [readStream open] or [writeStream open]
issue #4

refer:
http://stackoverflow.com/questions/20111643/exc-bad-access-sigsegv-when-uploading-with-ftp-library-on-ios-cfwritestreamop
Merge pull request #15 from t-oginogin/solved_BAD_EXEC_ACCESS_on_stream_open

solved BAD_EXEC_ACCESS on [readStream open] or [writeStream open]
Updated podspec (1.0.2).
Merge branch 'upstream/master'