Corrected test attributes path to dlls
Use the hintpath, the reference to FSharp.Core is always "FSharp.Core" in this instance, and thats not a valid filename
Merge pull request #621 from 7sharp9/fixcheckertests

Fix checker tests
Bumped project default version to 4.5

Updated tests to allow for extra System.Core reference
Merge pull request #622 from 7sharp9/updateTestProjectVersion

Bumped project default project version in test to 4.5