Merge pull request #6 from MaximTrushin/master

Solution and project files are changed for better support of SD 4.3.
Fixed test TestExtensionParseTree.
Assert.AreEqual changed to Assert.IsTrue because per official NUnit documentation Assert.AreEqual doesn't support multidimensional array. (http://www.nunit.org/index.php?p=comparisonAsserts&r=2.2)
Merge branch 'master' of https://github.com/bamboo/boo-extensions