remove core from the submodule list
turn session into hash before reset due to both sessions being reset (old and new)
Merge pull request #395 from RyanonRails/remove_core_module

remove core from the submodule list
Merge pull request #398 from RyanonRails/fix_session_reset

turn session into hash before reset due to both sessions being reset (old and new)
Version bump to 0.8.1
Regenerate gemspec for version 0.8.1