Revert "Merge pull request #62 from vid-io/cleanup/remove-proxy-api"

This reverts commit 8011afcad35816b55dd5af5ba8f3feb697244748, reversing
changes made to 4bf85ed93f5ee47d2db39f857629b79c5d3efb71.
#via requires 2 or 4 arguments
Use a custom HTTP header to indicate if a request was proxied and clean
up proxy specs
Implement proxy support for Request objects
Bump YARDstick threshold
Merge pull request #70 from hundredwatt/proxy-support

Proxy Support
Improve Content-Type parsing
Merge pull request #71 from tarcieri/refactor/content-type-parse

Improve Content-Type parsing
Allow ws(s) HTTP::Request schemes

This may resolve the present incompatibilities with Reel and the
websocket_parser gem
Minor cleanup
READMEstuffins
More READMEstuffins
More READMEstuffins
LICENSEstuffins
Add info about supported versions

Shamelessly taken from https://github.com/sferik/twitter/blob/master/README.md