Merge remote-tracking branch 'remotes/origin/develop'
buch of random fixes :)
Fix Trend widget

when there was only one valid data point avg value was always 1/2 of the
real avg.
[no-ref] Updating Trend Graphite widget

Added better support for default target settings, and move from
php templates to mustache
[no-ref] Adding simple 'Content' widget and updating Index
Fixes for Graphite Panel widget

Added supportfor defaults and more functions
Merge remote-tracking branch 'remotes/origin/master' into develop