try current_user when creating new object(donot send)

- this makes it compatible for project in which current_user is not defined
add spec to test gem work for project without current user defined
Merge pull request #13 from anilmaurya/master

make espinita compatible for project without current user defined
fix audit_destroy on audit behavior
add appraisal to spec under all supported rails version
fix audit_destroy on audit behavior
add appraisal to spec under all supported rails version
Merge branch 'appraisal'
update dependences
add espinita to appraisals
remove gemfile.locks from gemfiles
readme changes
readme tweak
Fix typo, permited => permitted.