Added support for horizontal orientation
Added support for margins and different ids

It is now possible to easily center the graph, and to render multiple graphs all with different settings by changing the div id
Added options to script call

New options are commented out, but provided as an example
Added radius and lineWidth to options
Updated README with explanations of options
Added examples illustrating new features
Removed options and div style changes

Removed "id" and "margin" from options, and the css style changes to div from within commits-graph.js
Merge pull request #1 from pseudocubic/horizontal-graph

Added support for horizontal graphs