Added DirectoryUtilities method to determine whether two folder paths are equivalent.

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rename : Palaso.Tests/IO/FolderUtilsTests.cs => Palaso.Tests/IO/DirectoryUtilitiesTests.cs
Fix AudioRecorder so it doesn't bully the system recording level to 100%.

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extra : rebase_source : 7e05876c53c2cd3deb7bcefa50a2b36465deb306
Temporarily ignore 2 tests that never did run on TeamCity
Fixed failing tests (they used to test copying folder to itself, which wasn't really a valid test).
Resolved conflict. Re-enabled tests, but they still might not work correctly on TeamCity.