Fix arrayData had at least 2 datas for avoir empty chart
Add defined option on area chart
Defined option is a table with multiple values ex: [0,null]
In this case 0 and null values will not drawing
Fix variable is undefined on DrawLine function
Merge pull request #8 from neptooo/master

Add disabled option on area chart
Fix bug with yMax
Merge branch 'master' of https://github.com/MythX/ember-d3-component

Conflicts:
	lib/components/chart.js
make area gradient vertical + make line gradient
Merge remote-tracking branch 'upstream/master' into gradient

Conflicts:
	lib/components/chart.js
correct demo and dist file