remove InstanceMethods module

Signed-off-by: Jorge Cuadrado <kuadrosxx@gmail.com>
rename openstruct type and fix test

Signed-off-by: David A. Cuadrado <krawek@gmail.com>
bump version

this is probably the last mongoid2-compatible version
Make tests pass on mongoid 3
bump version

this should be compatible with mongoid 3
make voteable module compatible with mongoid 3
normalize the vote and the voter_id
do not attempt to vote on invalid models
Use each instead read in FileServer

Signed-off-by: Jorge Cuadrado <kuadrosxx@gmail.com>