Merge pull request #76 from zbrunson/gh-pages

Remove double draws
Solved the double draw issue without using angular.copy() on the base chart object.  Made $watch on chart parameters more selective, and other small changes to prevent directive from making changes to watched objects.
Merge pull request #85 from Balrog30/gh-pages

Solved the double draw issue without using angular.copy()...
Update bower.json

Please update angular dependency. Works just fine with latest angular package
Merge pull request #87 from mgibas/patch-1

Update bower.json angular dependency
Removing JS errors if the chart is not initialized