Remove axis lines from index page

Removes the css which was overriding everything on the axis
We now specify tickSize(0) to remove the axis lines.
We also remove the unused monthNames in the connect example.

The latest update to the gitignore means that we ignore everything in
the dist folder, except for the insight.min.js file.
Remove all axis labels from index page

Finally found the right method!
Tells the axis to format all axis labels as empty strings, effectively
removing them.
Put best-fit line above bubbles
Merge pull request #59 from tpkelly/gh-pages

Tidy up front page