Merge pull request #32 from wcdolphin/patch/refactor

Refactor appwide configuration, added for all parameters.
Also adds support for Max-Age headers
Update documentation for app-wide configuration of options
Merge pull request #33 from wcdolphin/patch/app-wide-configuration

Add support of app-wide configuration of all options
Release version 1.5.0
Refactored actual header injection into separate function
Add Vary header setting to follow w3 suggestions
Fix module docstring
Bump Version number to 2.0.0