Hug

- Added support for overriding parameters via decorator to ease use of **kwargs
- Added built-in boolean type support
- Improved testing environment

- Adds support for attaching hug routes to method calls
- Hug is now compiled using Cython (when it is available) for an additional performance boost

- Added built-in support for serializing sets

- Added built-in support for outputting svg images
- Added support for rendering images from pygal graphs, or other image framworks that support `render`, automatically
- Added support for marshmallow powered output transformations
- Added support for marshmallow schema powered input types
- Added support for using individual marshmallow fields directly as input types
- Added support for attaching directives to specific named parameters, allowing directives to be used multiple times in a single API call
- Added support for attaching named directives using only the text name of the directive

- Added *args support to hug.cli
- Added built-in html output support
- Added multi-api composition example to examples folder
- Fixed issue 70: error when composing two API modules into a single one without directives
- Fixed issue 73: README file is incorrectly formatted on PYPI

- Fixed string only annotations causing exceptions when used in conjunction with `hug.cli`
- Fixed return of image file not correctly able to set stream len information / not correctly returning with PIL images
- Added examples of image loading with hug