Removed OpenWrap and tidied up

* Created new Solution and Project files using VS2012
* Deleted files related to OpenWrap
* Using 3rd party libs from \libs directory
* Update nUnit to version 2.6.3
* Update Mono.Posix from 2.6.4 to 3.2.3
* Changed target framework to v4.0

# You can now check out and build.