Improvements for task plot2html

CLI command `task plot2html' is renamed to `task report',
however old name is still available for compatibility.

HTML output of benchmark results is reworked:
     * scenario select dropdown is changed to aside menu,
       with scenarios methods grouped by classes
     * initially select scenario from URL hash
     * scenario results are divided into tabs
     * new layout and styling, from bootstrap framework
     * jQuery is removed
     * AngularJS is used for rendering all the data

Change-Id: I00db7016900952f397681045ff99d07a0714fafe