build on python3
fix python3 and python2.7 runtime errors
proper packaging
Preparing release 0.3.3
Back to development: 0.3.4
added test for seconds repeating
fixed UnboundLocalError in proc_second

UnboundLocalError: local variable 'dst' referenced before assignment
removed useless for loop, now empty from previous bugfix
Update croniter.py

iterator protocol added
Merge remote-tracking branch 'gh1/master'
Merge remote-tracking branch 'gh2/master'
Merge remote-tracking branch 'gh3/patch-1'
style & pep8
buildout2
switch over nose for tests
switch over nose for tests
badge
travis py3 build
travis py3 build
travis py3 build