Added WP7 solution and project.
Silverlight fixes
Silverlight fixes

- Replaces for all platforms the usage of legacy collections (ArrayList,
Hashtables, and ListDictionary) by their generic and recommanded
equivalents.
- Fixes calls which are unsupported in Silverlight.
Merge pull request #15 from Mangatome/wp7support

Support of Windows Phone 7 and Silverlight 4.