Ressurect imagesize-conduit's tests.
Add public domain test image from Wikimedia Commons.

Source: <https://commons.wikimedia.org/wiki/File:%27Coastal_Landscape%27_by_Kawase_Hasui,_1927,_two-panel_screen.jpg>.
Add test for jpn_art.jpg's size.
Correctly use MonadResource (doh!).
Add test for createThumbnails.
Derive instances of Eq and Show.
Derive Typeable.
Add tests for rejection due to file or image size limits.
Prepare cabal file for first release.