TLghc 0.5.0.0: Working interpreter with many examples.

The TransLucid interpreter, available at https://github.com/plaice/TLghc, has been significantly improved for version 0.5.0.0. The test suite contains a number of examples, found at https://github.com/plaice/TLghc/tree/master/test/tl. For each of those example files, there is an output file at https://github.com/plaice/TLghc/tree/master/test/out.