added StripURLQuery flag
Removed unused strings package from import.
Removed undefined DefaultRateLimiter.
A simple dependency injector and service container pattern
Merge pull request #3 from maz/strip-url-query-flag

Added StripURLQuery flag
Merge pull request #5 from vinays/patch-1

Removed unused strings package from import.
Merge pull request #6 from vinays/patch-2

Removed undefined DefaultRateLimiter.
Merge pull request #8 from 99designs/features/depinject

A simple dependency injector and service container pattern
Added Retry-After header to 429(Too Many Requests) response.

Retry-After header is optional according to RFC6585 http://tools.ietf.org/html/rfc6585#section-4 but it would be nice to have that flexibility. :)
Rebased from 99designs