Merge pull request #109 from forio/documentation

continuing work on narwhal --> contour, fiddle --> github fiddle, and general updates as we move to release -- see details
Release 0.0.53
Release 0.0.54
Clan up spaces
Fixed calculation of padding for axis titles when setting new data
Added the series name as class to the line chart markers
added key to the series groups for line charts so lines animate correctly when chaining data dynamically
Release 0.0.55
Release 0.0.56
Release 0.0.57
fixed gruntfile to compile uncompressed css file for production releases
Create COPYRIGHT
Implemented internal padding for horizontal frame
fixed tests to use new internal padding
Clean up
Fixed adjustment of label positions when rotated for ordinal axis
Implemented basic legend visualization
Created base unit test for legend
added legend to demo
Release 0.0.58