First usable release after some heavy reworks All issues in #53 have been resolved among many other. bookwyrm is still considered unstable, or at least in some beta-phase; this release was somewhat rushed just because I wanted it out the door. Here it is. Highlights of this release are: * improved log handling and C++-Python interfacing; * learned --accuracy option, specifying fuzzy string match accuracy; * adhered to the modifier passed to --year; * display how many plugins are still running; * fix and overhaul plugins/libgen.py; * add a test framework with some tests - run these with ctest(1); * overhauled Python API to only rely on dicts (more Pythonic); * resolve mirrors only for items that the user wants to download: * HTTP headers can be returned and set before download; * overhauled out-of-code documentation, and * added a CHANGELOG.md. Future releases will likely refer to this changelog instead of inlining changes here.