[update] chaining statements to become python 3 compatible
[update] removed unnecessary list() wrapper in some collections.
[config] travis configuration
[config] project configuration to run tests using nose and test with distinct python environments.
[update] more exception handling compatible with Python 3
[update] using six library to port the lib to python 3.
python3: Merge remote-tracking branch 'paulocheque/master'

* paulocheque/master:
  [update] using six library to port the lib to python 3.
  [update] more exception handling compatible with Python 3
  [config] project configuration to run tests using nose and test with distinct python environments.
  [config] travis configuration
  [update] removed unnecessary list() wrapper in some collections.
  [update] chaining statements to become python 3 compatible

Conflicts:
	jsonpickle/pickler.py
	jsonpickle/util.py

Closes #27
Closes #31

Signed-off-by: David Aguilar <davvid@gmail.com>