fix `#invalid?`

Previously failed due to not accepting the `context` argument.
Bump version
Fix some style things
I like double negation.
Handle newer rubocop
Merge branch '1.0'

* 1.0:
  Handle newer rubocop
  I like double negation.
  Fix some style things
  Bump version
  fix `#invalid?`
Don't run rubocop on Travis
Merge branch 'master' of github.com:cequel/cequel

* 'master' of github.com:cequel/cequel:
  Try adding tzinfo to development dependencies
  Set up time zone in spec helper and make sure tzinfo is loaded
  Make if/else chain more consistent
  Spec for casting TimeWithZone to UUID
  Fix DateTime cast in Rails 3
  Cequel::uuid generates UUIDs from more types of input