basic v5 started
Added V5 to Story, Project and ACtivity.
Removed tests
Works with ruby 2.1
Moved dependencies to gemspec
Use PivotalTracker encode options method insted of acitivity method.
Fixed encoding options method in activity, added method to parse kind attribute in resource type and action
Added to_i when convert to timestamp
Refactorized membership to api V5
Added Coercion::Hashie to activities and project
Adds epic