Initial graphene import.
Gemify graphene.
Merge remote-tracking branch 'upstream/master' - checking out --ours for files that conflict

Conflicts:
	lib/graphene.rb
	lib/graphene/axis.rb
	lib/graphene/axis_label.rb
	lib/graphene/boxes.rb
	lib/graphene/canvases/svg.rb
	lib/graphene/chart.rb
	lib/graphene/grid.rb
	lib/graphene/legend.rb
	lib/graphene/point_mapper.rb
	lib/graphene/renderable.rb
	lib/graphene/text.rb
	lib/graphene/value_labels.rb
	lib/graphene/views.rb
	lib/graphene/views/base.rb
	lib/graphene/views/histogram.rb
	lib/graphene/views/line.rb
Fix SVG style tag output
Merge pull request #1 from powershop/svg_style_fix

Fix SVG style tag output
tolerate non-integral grid ticks, useful if you set the axis maximum to a number that is not an even space