Update SrcML.Data to use new srcml

[patrickfrancis]

The newest versions of srcml have made changes to the tags. For example, the namespaces have changed, some tags have moved in the srcml output, some tag names have changed, etc. The data framework needs to be updated to handle these changes.

[vinayaugustine]

We can track specific issues in this thread:

• Dynamically generate the srcml in the unit tests #74 Fix tests to dynamically generate srcML
• Update to handle new Element namespace
• Update to handle LINQ entities