C# OAuthBase removes oauth_callback when signing

[GoogleCodeExporter]

What steps will reproduce the problem?
1. Using C# OAuthBase.cs
2. Request oauth_callback
3. Callback is removed from request following signature

What is the expected output? What do you see instead?
Callback remains in request

What version of the product are you using? On what operating system?
http://oauth.googlecode.com/svn/code/csharp/
Svn rev 1267

Please provide any additional information below.
Attached version fixes this (and another minor issue). Fix is adequate for my 
purposes but should be reviewed before inclusion.

Original issue reported on code.google.com by [email protected] on 21 Jun 2012 at 11:26

Attachments:

• OAuthBase.cs