Made py.test skip test_ia_mine if Gevent isn't installed,
and prettified the skips in test_mine
Fixed bug in test_api where test_mine would never get skipped.
Changed test specifics for test_ia_metadata and test_ia_download, b/c
The list of formats and links aren't necessarily in order.
Tox now tests both with and without speedups, for both 2.6 and 2.7.