Prevent race condition from orphaning node bindings on successive renderings
Remove rendered handler once fired
Ensure items that have not yet been rendered that also weren't previously in the set are cleaned up
Iterator test for ensuring bindings are destroyed
Merge pull request #624 from Shopify/fix-iterator-binding

Fix iterator binding detached DOM issues
Fix up model memory usage profile test
Add a performance test for accessors with varying amounts of sources
Change the source tracker pushing and popping to only instantiate source arrays when needed instead of preemptively.

 - Batman.Property source tracking is built upon a source tracker stack that gets pushed to and popped off of as properties are recalculated. This uses a little boolean to make thing a bit faster by delaying the push of a new source array to the stack until the first item goes to be added to the stack, and otherwise if no items are added no arrays are created and the boolean is just flipped back.
Merge pull request #622 from adamyanalunas/middle_click_rotue

Added helper, test and catch to bypass middle-click events.
Build dist
Defer function binding until bind
In IE7, it is not possible to get a character from a string using the box [] notation.
This caused IE8 to go return defined, enter a continious loop and then cause a stack overflow error.

Amended the offending lines to use charAt instead.
dist
Merge pull request #630 from Shopify/firenodechange-fix

Defer function binding until bind
Move the source tracker stack back onto Property to see if it is any faster as a closure scoped constant.
Make the source tracker stack valid property its own variable
Support all symbols with unescapeHTML
Avoid creating unescape node every time for performance
Cache node on first request to avoid issues with test environment
Merge pull request #633 from Shopify/more-unescaping

Support all symbols with unescapeHTML