Fix #7 - Wrap canvas in div with to avoid distortion when container has padding

Issue in Chat.js, see https://github.com/nnnick/Chart.js/issues/507 and https://github.com/nnnick/Chart.js/pull/722
0.3.7
0.3.7
Merge branch 'master' into gh-pages

Conflicts:
	dist/angular-chart.js.tar.gz