I was being silly with the .gitignore file, as it doesn't ignore files
that are already under version control..
Added the img plot class which is the default class assigned to Images
by the writeHtml function
Added mouseover text to images, using the title parameter as the string.
Changed formatting in README.md
Merge pull request #1 from benkrikler/master

Pull in changes made in my personal fork of the plotify repository