Added Reachability dependency and detection

* Removed BlocksKit dependency.
* Added libextobjc as dependency for its excellent
  @weakify and @strongify macros.
Fixed heartbeat not called on incoming pong
Fixed missing parameter on incoming::end event
Improved appledoc-style method documentation
Removed bindEvents from TransformerProtocol
Added plugins architecture to Primus
Updated author in podspec
Updated project file
Improved JSON decoding for non-NSData objects
Moved Primus methods to PrimusProtocol
Updated README with Cocoapods information
Improved test target Podfile definition
Bumped version to 0.0.2