Replace native .options with jQuery .children()

Fixes aldeed/meteor-autoform#101
Add jquery dependency

Relates to aldeed/meteor-autoform#101
Reimplement with jQuery

Fixes aldeed/meteor-autoform#101
Add missing )

Relates to aldeed/meteor-autoform#101
Add !== undefined to .attr to make equivalent to hasAttribute
Merge pull request #103 from mjgallag/master

Replace native .options with jQuery .children()