Only build the master branch on Travis
Start (almost) all over
Flesh out the integration tests
Simplify Feed wrapper
Wrap feed entries
Use default faraday connection
Improve the inspect of feeds and entries
Use constant lookup chain for default parsers
With bad xml, raise ParserNotFoundError
Add configuration object
Configure parsers
Test the parser and fetcher directly

Let the integration tests cover the factory methods, stick to instance
methods in these tests.
Only one argument is being used for Fetcher
Describe fetch_and_parse spec properly
Use supplied parser