Factor out httpConfigurable functions
Create classname to Endpoint

That took way too long for me to figure out.
Add interface specs, for confidence
Factor duplication out of Method class and into httpConfigurable mixin
Don't require httpConfigurable function wrapper

This gives httpConfigurable's an init function so they don't have to be wrapped in a function.
Improve spec description
Don't need superagent browserify
Fix header bug

Headers were not being successfully sent to the server, this fixes the bug and covers it with tests.
Allow headers to be set from a method object
Linting
Merge pull request #38 from kahnjw/factor_out_repitition

Factor out repitition