puts rspec dependency in gemspec
stacked2: improves mirroring and general push logic
stacked2: adds callback helpers
activable: disables update callbacks on remove
adds the model_shims class
apibase: simplyfies response logics
stacked2: adds _will and _is methods
updates version
gcontroller: removes error when not loaded
activable: adds observer support
Stacked2: changes mirroring to just warn if stepping over another property.
model_shims: adds options
tag set attributes: initial load
platanus: changes gem version