a cdx server need implement a single interface:
load_cdx(self, **params)
CDXServer and RemoteCDXServer distinct classes in cdxserver.py
utility function cdxserver.create_cdx_server() to create
appropriate server based on input
move to distinct packages: pywb.utils, pywb.cdx, pywb.warc, pywb.util, pywb.rewrite!
each package will have its own README and tests
shared sample_data and install
adding StaticHandler and loading templates and static resources from current package
add default template and static data to be included in the pywb package
add test for custom static route