Using LanguagePrimitives.ConvertTo (to emulate what would happen if the property were a regular .Net property typed as string), we now convert the value assigned to an XML property to string.
* Added tests to close code coverage in CIM area
Added CimAdapter.Tests for adaptation layer (code cribbed from BVT tests)
Added SessionOption.Tests.ps1 (Code cribbed from BVT tests)
Modified CimClass tests by adding more tests
Added CimSession.Tests for basic tests of New-CimSession cmdlet
Added CimInstance.Tests for basic tests of Get-CimInstance
* Add CI tags to tests
* unify test execution to use try/catch for marking tests as skipped
moved test which retrieves cimclass via method to feature as it is not
a common operation, this test can take some time as well
