dynamic events implementation
prepare for 1.0.0-pre0
put template not found error directly on page
add ability to set and get a lookup host on a view

This gives the ability to put a host object that will be looked at in
Blaze.prototype.lookup.
bump version to 1.0.0-pre1 and add "get" helper
add blaze overrides and dynamic template error
bump version to 1.0.0-pre2
add data context for event handlers as last arg
bump versions to pre3 and remove versions.json