Fixed the regex to accomdate for scientific notation in strings.

Fix for Issue https://github.com/mhemesath/r2d3/issues/101 by modifying the RegEx. This removes '-' as a delimited between strings such that "35-48" will not parse as "35" and "-48". I haven't seen a string like this though, most are comma or space separated. 

I've manually updated the r2d3.min.js file (I have no idea how to use build files in windows - know anywhere I can read about them?). All the tests seem to pass in IE8.