properly space progress bar milestones

[EWaterman]

Partially implements user story #5

Milestones are created and working but are currently not spaced properly.

This task is to add the css/js to properly space the milestones along the progress bar based on their numerical value.

Ex.
A milestone with a value of 0 will be placed at the very beginning of of the bar
A milestone with a value of MAXCOUNT will be placed at the very end of the bar