Improve performance by not rebuilding index when iterating
add pluck support
recalculate index for remove event

Backbone's remove event passes the removed Model's index in the options
hash. This may be used by other upstream listeners (e.g. Backgrid) and
should match the index in the VirtualCollection.
adding comments
Clone options object
0.4.12
Update version numbers
Update README.md
specs for pluck
adding specs
refactor to use parentCollection instead
Merge pull request #30 from Morantron/add-pluck-support

Add pluck support
Merge pull request #29 from Morantron/improve-performance

Improve performance
0.4.13
jshint
Add the `extend` function to VirtualCollection
Merge pull request #31 from enov/add-extend-function

Add the `extend` function to VirtualCollection
0.4.14
Update version numbers
Update README.md