added tags to .gitignore
started to clean up README file
whitespace
broke Association stuff out of the AttributeAssignment module; refactored long methods; cleaned up tests
updating readme
aliasing assignment method
moved specs into spec/lib
added some development gems (guard, pry, simplecov) and Guardfile
moving associations code back into attribute_assingment
ruby syntax highlights
code indentation in README
code indentation in README
Merge branch 'refactor_assign_attributes'