change template prefix to curly brackets

Closes #209
chore: release 0.4.0
chore: start 0.5.0 iteration
chore: switch to karma-hashspace

Closes #215
build: use the latest Chrome on SauceLabs
build: use equal number of browsers in each Saucelabs run
feat: support objects as pipe modifiers

Closes #211
chore: add test-results to .npmignore
Mostly playground typos + removal of dupe SubTemplate sample