Explicitly set shape and dtype when copying datasets.
Merge pull request #4 from kiyo-masui/bugfix_group_copy

Explicitly set shape and dtype when copying datasets.
Minor changes to memh5.
Moved unit tests into package.

Unit tests should now be finadable by nosetests.
Set up doc directory.
Merge pull request #5 from kiyo-masui/path_cleanup

Moved unit tests, set up documentation.
Merge branch 'master' into cache_tools

Conflicts:
	README.rst

Also made changes to cache_tools and associated tests, making consistent
with restructuring in master.