Added reference to parent in the migration file and model so that comments can keep track of their parents.
Fixed bug in previous commit.
Merge remote-tracking branch 'origin/master'

Conflicts:
	config/routes.rb
index.html => local redirect
user_controls => bug fix
rewrite: db & model; application#db_init; post#api_list; fixed all warnings
#
user apis; index.html
post apis; index.html