Experimental package

List of changes:
* Fixed a couple of bugs in AssemblyReplacer that only applied to Apiary
* The api has changed and the json now has `request` and `responses` instead of `incoming` and `outgoing`
* The json generator had JsonDcument hardcoded on some places, adapted it so it works with apiary
* Added the replace.ToRuntime and replace.ToDesigntime where needed
* Instead of referencing the non experimental dll, the minimum needed files are reincluded in the experimental .fsproj. This was needed otherwise AssemblyReplacer wouldn't work. It still only has the Apiary provider, the extra stuff is internal
* Changed the sample to cope with the new signatures generated by json provider
* Added the new type of signature tests for Apiary also