Mongoid + rails-api Support

Mongoid + rails-api support
======================

Work-in-progess
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- Forked from https://github.com/mediatainment/simple_token_authentication with working Mongoid Support.
- Original idea from [@smarquez1](https://github.com/smarquez1) on issue #38.

Changes
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- Modified ```act_as_token_authentiation_handler.rb``` to support ActionController::API used on rails-api.
- Modified ```act_as_token_authentiation_handler.rb``` to support passing of options to ```before_filter```.

References
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- Issue #87
- Issue #38