adding a test stub
add blosc import to allow running doctests from nosetests
run unittests similarly to doctests
more elaborate instructions for running the tests
testing exceptions raises during compression
testing exceptions raises during compression_ptr
testing exceptions raised during decompress
testing exceptions raised during decompress_ptr
refactor the test code a little
test exceptions raised when packing an array
test exception raised by set_nthreads
check exception raised during unpack_array
Merge pull request #32 from esc/test_suite

growing a test suite