Updating GetSchema so it is now parameterized so that the schema file name can be varied. Default overload kept on SolrServer. This to fix #119

Removed unneeded GetSchemaCommand (and tests) as work towards #94
Upgrade sample app project to VS2012
Add new GetSchemaOverload to mock
Update FAQ.md
Fix for build script paths (When using VS2013 + FSharp 3 without FSharp 2 installed)