add bar margin option

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#	modified:   lib/veasy.js
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add more test to line chart
mod div.pane css border rounded
fix centering pie chart #3
fix pie chart legend
add bar margin option

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#	modified:   lib/veasy.js
#	modified:   src/veasy.coffee
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add more test to line chart
Merge branch 'master' into develop
mod package / bower .json
Merge branch 'release/0.0.14'