Create a minimal wrapper using Boost.Python and write compilation instructions into README.

A minimal wrapper has been written in 'wrapper.cpp' using Boost.Python. This wrapper provides a function called 'version' which returns a string that represents the current version of the software.

Unit tests for the wrapper have been written in 'test_wrapper.py'. The only test at this point checks that the returned version number is correct. In addition, a global test file 'test.py' has been written, in order to test all prospective modules in the future.

The 'Jamroot' and 'boost-build.jam' files are also provided, in order to compile the wrapper using Boost's bjam utility.

Finally, compilation instructions have been written to 'README.md'.
Reformat unordered lists with asterisks instead of hyphens.
Rename project from 'pyvienna' to 'ViennaGrid for Python'.