remove .git folder after clone repo, sketchplate template install command basic implementation
install a template via zip archive, github <user>/<repo> or url string
installTemplate process for non-sketchplate templates
fixed commander.js depdendency to v1.0 since 2.0 removed choose & prompt
fetch now accepts `tag` and `branch` properties for `clone` operations, new unit tests added and passing
added tag support for installTemplate() and completed unit tests
add origin to template.json for downloaded templates
merged template-install command into develop