v0.3.0

Project:

• All .es6 files have been renamed to .js.
• cassowary.js is now included in dist/autolayout.js.
• Added source maps to dist/.
• Added benchmarks.
• Added autolayout.js to bower.

Core:

• Fix: Numbers in visual-formats now support decimals (e.g. [view(10.5)])

Extended visual format:

• Added support for view stacks (e.g. |[column:[header(50)][content][footer]]|)
• Added support for equal spacers (centering) (e.g. |~[centered(100)]~|)
• Added support for proportionally sizes spacers (e.g. |-12%-[content]-(10%)|)
• Added support for disconnections -> (right/bottom alignment) (e.g. |[left(10)][left2]->[right]|)