bug 1012862 - add html output to the metaharness

This patch adds a results.html to the output zip file which contains a summary table of results from each sub-suite that is run. Each sub-suite will also generate a HTML result file in a subdirectory that is linked from the top-level results.html.
Address review comments
Merge pull request #127 from luser/html-result-file

bug 1012862 - add html output to the metaharness