Transfered each resource in it's separate class file.
Introduced interfaces for all resources and the clients
Accept only application/xml (no JSON)
Change version number to 1.1
Cleanup created code and resolved compiler all warnings
Introduced the IPublishChannelResource which is able to retrieve all user's data on their current available publish channels

This method is not tested, because I'm still missing access rights to the sandbox environment
Introduced delete method for a real estate. This method seems to be possible for real estate objects which are not published
Merge branch 'm4cx-refactoring' of https://github.com/m4cx/IS24RestApi into develop

Conflicts:
	IS24RestApi/IS24Client.cs
Merge remote-tracking branch 'remotes/origin/mganss-test' into develop

Conflicts:
	IS24RestApi/IS24Client.cs
Add more tests
Split tests according to resource types