Fix outstanding pre-release issues

[salcock]

Specifically:

• add environment variable to change RouteViews and RIS base URLs if required (Allow RouteviewsArchiveUrl to be configurable #18)
• updated meta/collectors/NAME output format to match BGPStream broker format (API: discrepancy in format of responses for /meta/collectors/{name} #22)
• add support for multiple "type" parameters in data requests (API: support multiple "types" for a data/ query #20)
• add BaseFinder class that implements methods that are common to all Finder classes (clean up periodicscraper code #13)
• add support for the "human" parameter to produce human-readable JSON output if set. (API: add support for human parameter in the data/ API #21)
• ignore "dataAddedSince" parameter for historical data requests (i.e. those with a specific end time) -- this is to ensure parity with the behavior of the BGPStream broker so as not to cause problems with downstream tools that might rely on this behavior (e.g. bgpview). (API: ignore dataAddedSince parameter when until is not "unlimited" #23)
• collector aliases are now tracked in a table in the database, rather than being hard-coded. (Collector aliasing should not be hard-coded #24)
• updated docker-compose.yaml to support out-of-the-box deployment by new users. (add documentation/examples/explanation for setting up instance #16, Make port config and exposure in docker configurable #8)
• added deployment instructions in DEPLOY.md (add documentation/examples/explanation for setting up instance #16)
• replaced README.md with something suitable for a "finished" project rather than outdated implementation planning.
• ensured double slashes caused by the special case of "route-views2" URLs were removed before returning the URL to a requester.