Update gemspec version locks

Otherwise the gem cannot even be installed and tested
Remove gem `strong parameter`
Since it is already in Rails 4 core
Merge pull request #1590 from PikachuEXE/patch-1

Update gemspec version locks
Fix "underscore" does not exist form ActiveModel::Name
fix 'block in models_pool': undefined method '+' for Rails::Paths::Path
Merge pull request #1602 from istana/rails-4

installer errors fix
model_name to_s for polymorphic associations
changed devise version for rails 4, but dependencies issues for mongoid
ActiveModel demodulize and underscore fix
ActiveModel underscore fix fix
These @model_name are strings already
Merge pull request #1607 from istana/rails-4

another rails 4 compatibility fix
Merge pull request #1606 from ocolot/rails-4

Rails 4
Point carrierwave-mongoid and mongoid-grid_fs to master branches to resolve activemodel dependency error
Merge pull request #1609 from rainkingventures/resolve_mongoid_dependency_conflicts

Point carrierwave-mongoid and mongoid-grid_fs to master branches to reso...
Make CI runnable for AR
Make CI runnable for Mongoid
Rails 4: don't assume ActiveModel::Name to be String.
Don't support models that aren't properly namespaced.
Merge remote-tracking branch 'softpro/rails-4' into rails-4

Conflicts:
	lib/rails_admin/config/model.rb