#22 added handling of post request, upload request and remembering the referer
#22 webzime now utilizes chain of responsibilty pattern throug the ActionHandler base class and subclasses: AuthenticationChain, StaticContentChain, PageProcessorChain, MediaChain
#22 Added more tests that use http client to send data to webzim application.
#22 moved getFileMimeType method to the FileManager helper class
Added smile_icon for tests.