v0.7.0

This release has some important improvements:

• Multiple reader classes are allowed (#63, thanks to @everplays)
• acts_as_reader: Replaced :scope option by class method (2a1649e)
• acts_as_reader: The after_create callback is customizable (1e4b8f2)
• Improved performance of cleanup_read_marks! (#64, thanks to @pyro2927)
• Added bin/console (useful for developing the gem)
• Lots of code and spec cleanup

If you are using an older release of this gem, please read the the upgrade notes!