Merge branch 'release/1.3'
Update Developing_With_BrightstarDB.rst

Fixed link to Developer Quick Start
Moved unit test suite over to NUnit

Work for issue #26
Started work on support for LINQ IGrouping expressions.
More work on LINQ grouping

Integrated Relinq source code into core BrightstarDB solution to make
debugging easier. Work on grouping is not completed yet though.
Revert "More work on LINQ grouping"

This reverts commit db1e611fef7c9d85d7bfc4f31fdc3c52eb1714ce.
Revert "Started work on support for LINQ IGrouping expressions."

This reverts commit b7d46fa62cf075303a490b3452ff6e0503ad59f9.
Moved unit testing over to NUnit

Merged in work done originally in feature/grouping branch for issue #26.