Removed OpenWrap

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

Added the Posix version for  v4.0
Removed unnecessary nunit dll's
Merge pull request #15 from holytshirt/master

Removed OpenWrap and tidied up