Add columns for % covered form and % covered lines.
Do not output 0-width bars.
Better summary styling, proper percentage output.
Ignore target, generated POMs, emacs temp files and .lein-failures files.
Merge pull request #21 from frankshearar/ignore-emacs-temp-files-and-target

`git status` is a bit cluttered. Ignore a bunch of temp files and generated nonsense.
Merge pull request #15 from JacekLach/percentage-report

Percentage report