* py3.7 fixes:
- add __repr__ to WBException for consistent output in py3.7
- don't raise StopIteration in generator, just return
* ci: add py3.7 builds to travis and appveyor, (don't include in integration test suite for now)
windows build fixes: all tests should pass, ci with appveyor
- add appveyor.yml
- path fixes for windows, use os.path.join
- templates_dir: use '/' always for jinja2 paths
- auto colls: ensure chdir before deleting dir
- recorder: ensure warc writer is always closed
- recorder: disable locking in warcwriter on windows for now (read access not avail, shared
lock seems to not be working)
- zipnum: ensure block is closed after read!
- cached dir test: wait before adding file
- tests: adjust timeout tests to allow more leeway in timing
- ResAggApp -> BaseWarcServer
- AutoApp -> WarcServer
- move index related files to warcserver.index package, tests to warcserver.index.test
- move resource loading related files to warcserver.resource package, tests to warcserver.resource.test
- pywb.cdx -> pywb.warcserver.index
- split pywb.warc -> pywb.warcserver.resource or pywb.indexer (for cdx generation)
- bump to 0.51.0 for now!
- tests for pywb.warcserver should be working