add collections

Signed-off-by: Hake Huang <hakehuang@gmail.com>
add restrictions to collections

Signed-off-by: Hake Huang <hakehuang@gmail.com>
fix a typp of collection

Signed-off-by: Hake Huang <hakehuang@gmail.com>
Merge branch 'master' of github.com:island205/openscrum
Merge branch 'master' of github.com:island205/openscrum

Conflicts:
	model/model.coffee
Merge branch 'master' of github.com:island205/openscrum

Conflicts:
	model/model.coffee