added jquery sag plug-in

The official query sag plugin doesn’t work with the version of query
I’m using… got the modified version from
https://github.com/brainbits/jquery-svg.
I should find a way to add it to bower
added connections in system diagram

Angular's team has added a way to define some kind of "delayed
binding". You can use it by prefixing desired attribute with ng-attr-.
It waits untill the binding evaluation is valid and adds real attribute
with proper value. In your case it would be: