Merge pull request #180 from ds125v/center_dnd_status

center dnd-status message
Fix course module indenting.
Merge pull request #182 from gjb2048/master_modindent

Fix course module indenting.
Make course edit buttons look more like BS dropdowns, prevent jumping of buttons by hidding filler
docblock tweaks
make generation of strings for PHP decache more robust
Merge pull request #184 from jobyh/grunt-decache_updates

Make path handling more robust
SVG recoloring and some Gruntfile tidying

The SVG originals are copied from core Moodle then minified with
svgo (saving about 50% size).

For whatever reason is seems to take two refreshes for the images
to update to their new color, even after running decache.

In the gruntfile I used the simpler src/dest file format for things
with only 1 input and 1 output file.

I also added the ability to specify MOODLE_DIR as a environment
variable.