array diff WIP
functional tests pass
clean up array diff algorithm
minor tweak
unit test pass
enable $event in v-on expressions + enable e.preventDefault()
targetEl -> delegationTarget
remove event delegation
return event handler return value
fix non-propagating set events triggering parent array change
update todomvc example
allow $watch on $data
also propagate array mutations in observer
fix v-repeat diff algorithm for v-transition
more test cases for transition+repeat
fix #190 v-partial
bump versions
make vm.$get recursive
perf tuning
expression cache

expressions with the same signature are now cached! this dramatically
improves performance on large v-repeat lists with multiple expressions.