Official Mono support

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Unquote is not officially supported on Mono, however, it does not use any 
native Win32 calls and has been seen working on Mono without any issues. 
Specifically, the .NET 4.0 build has been seen running on Mono 2.10.8.1 (Debian 
2.10.8.1-5ubuntu1) inside a version of the F# 3.0 Interactive built from the 
github sources.

We'd like to "officially" support Mono, since it is popular in the F# open 
source community. To achieve this, we need to determine which version(s) we 
wish to support, and figure out a way to run our test suite against it with 
successful results.

If we do run into any issues, they will likely be related to reflective calls 
against private / internal methods. Ideally we'd like to avoid having to create 
a Mono-specific build (i.e. we'd like the .NET 4.0 / 4.5 build(s) to work 
without modification on Mono).

Original issue reported on code.google.com by stephen....@gmail.com on 31 Mar 2013 at 4:06