Fix some issues
*the stream is still open if dispose before connected
*RawJsonMessage has "Delete" message type
Fix bugs, and change some of apis

* fixed a bug on Objects/Places.cs (that was a mistype).
* fixed a bug on Objects/User.cs (parsing UtcOffset, it sometimes throw an exception)
* swap args in tokens.Streaming.StartObservableStream and OAuth.GetTokens
* delete Property.cs
Merge branch 'pullreq/Rx' of https://github.com/azyobuzin/CoreTweet into azyobuzin-pullreq/Rx

Conflicts:
	CoreTweet.Streaming.Reactive/Stream.cs
Fix a bug on parsing User
Fix a bug on parsing User
Fix the problem about licenses

CoreTweet is now licensed under both of the Ms-PL and the MIT
Change over the JSON library to Newtonsoft.Json (processing)

This is a processing commit, not works yet.

I've rewrited Objects/User.cs to be parsed with Newtonsoft.Json.
It is tested and works very very well!
CoreTweet will be faster and get more maintainability.
Downgrade the Newtonsoft.Json.dll to the release 4.5

This commit is for the mono 2.10 compatibility.
Modify to use NuGet
Change over the JSON library to Newtonsoft.Json (processing 2)

On:
Objects/Converters.cs
Objects/Entity.cs
Objects/RateLimit.cs
Objects/SearchQuery.cs
Objects/Setting.cs
Objects/Status.cs
Re-defined Objects/List.cs with Newtonsoft.Json.
Change over the JSON library to Newtonsoft.Json (processing 3)

On:
Objects/Embed.cs
Objects/Helps.cs
Merge remote-tracking branch 'remotes/origin/newtonsoft_json' into redefine_places
Redefine Objects/Places.cs with Newtonsoft.Json
Merge pull request #6 from laco0416/redefine_places

Redefine places
Change over the JSON library to Newtonsoft.Json

On:
Objects/Cursored.cs
Messages.cs

This commit contains new endpoints that enumerates all of pages in the cursored endpoint.
Merge branch 'newtonsoft_json'

Conflicts:
	CoreTweet.userprefs
	CoreTweet/Objects/User.cs
	CoreTweet/Streaming/Messages.cs
Edit readme and license