Fix PHP 5.4 bugs. Fixes #108
Add new twig filter for more flexibility.
Update readme to point to github pages instead of the out-of-date wiki.
Add ability for rollup columns to access stats for other columns from their twig template.
Fix bug in Chart header with negative numbers.
Add basic dashboard functionality. Fixes #114
Fix for a small bug in show/hide JS for Google Charts
Updating the public dependencies to the latest versions
Small fix to format only the HTML value, not overall value
Merge remote-tracking branch 'upstream/master'

Conflicts:
	classes/report_formats/XlsxReportFormat.php