Merge pull request #359 from ovatsus/master

Fix inconsistencies in namespaces
Merge pull request #361 from ovatsus/master

Several JsonProvider improvements
Allow to post a JSON value to a given URI. This is "untyped" start for issue #250.
Merge pull request #251 from forki/Post

Allow to post a JSON value to a given URI.
Allow to post a JSON value to a given URI. ReleaseNotes and cleanup
Merge pull request #362 from fsharp/Post

Allow to post a JSON value to a given URI. ReleaseNotes and cleanup