2.0.0-beta2

• Removal of the library. The interfaces for pre- and post-processors are now part of the plugin.
  Instead of the library, you now have to also add a dependency on the plugin to your library dependencies.
• Support for json plain text content types. This is based on the mediaType property.
• Improved compability with Windows.
• Always run the requests, even when they do not have changed. Also fix a bug in up to date checking.