[WIP] New shape method

[raphamorim]

• More elegant
• More More lighter
• Better to test

New API design:

old way

Reads CSS without read/search by elements

origami('#canvas')
  .load(".className")
  .shape(".className")
  .draw();

new way

NOTE: Now element must exist in DOM.

<div class="className">...</div>

origami('#canvas')
  .shape(".className").draw(); // maybe origami().html() would be better

[coveralls]

Coverage remained the same at 91.667% when pulling 3dfd38549c97c7219c24fc385e29af93a80f4e1d on feature/new-html2canvas into 252534827a5dc53ef98bd75ee1411304074a5780 on master.

[raphamorim]

Ref: #29