calls: rename enableTracks() to toggleTracks(), since it takes a state arg

index: don't use rivets to update src attribute of <video> elements Changing this attribute twice in a row is bad and shouldn't happen, and we're already setting it in the view (so we can call el.play() immediately afterwards).

pipelines: making grep quiet is actually not helpful at all

pipelines: install curl for contrib/updatesri.sh check

coffee: update compiler to 1.11.1, recompile

pipelines: run hg diff for users first, then check wc -l output

pipelines: install npm for `make devel`

pipelines: more specific regex for ansible.log

pipelines: stop explaining the obvious

pipelines: also make sure .coffee files compile to the committed .js files