[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 3dfd385 on feature/new-html2canvas into 2525348 on master.

[raphamorim]

Ref: #29