Travis: extend tests

Extended tests:
- run puppet-lint, disabled some checks for now:
  - disable_80chars
  - disable_autoloader_layout
  - disable_class_parameter_defaults
- test also rvm 2.0.0 but ignore some puppet versions for this case:
  - 2.7.21
  - 3.0.2
  - 3.1.1
- add some more puppet versions to be tested (3.2.4, 3.3.0)

Signed-off-by: Danny Al-Gaaf <danny.al-gaaf@bisect.de>