Add support for the CSS3 sizing spec

Sources:
* http://www.w3.org/TR/css3-sizing/
* http://caniuse.com/intrinsic-width
Update repo URL for Travis badge

Switched to SVG version at the same time
Merge pull request #115 from malept/css3-sizing

Add support for the CSS3 sizing spec
Ignore NPM debug logs
Update package.json config

- Reran npm init to use the latest NPM format.
- Cleaned out unused variables (engine, directories).
- Updated EditorConfig settings to reflect the NPM 2 space default.
Support simple blocks in functions

This adds support for simple blocks within functions, for example:

    calc((100% - 1px) / 2)