remove ambiguous leading 0's in timestamps whenever we include day portions

closes #164
Merge branch 'master' of github.com:mojombo/chronic
Add support to travis
Merge pull request #171 from michelboaventura/master

Add .travis.yml
remove unused variable

It removes below ruby's warning.

* warning: assigned but unused variable
use parentheses at argument of an assertion

It removes below ruby's warning in test.

* warning: (...) interpreted as grouped expression
Merge pull request #170 from kachick/improve-remove_warnings

Clean up ruby's warnings
Merge branch 'master' of github.com:mojombo/chronic into localization

* 'master' of github.com:mojombo/chronic:
  use parentheses at argument of an assertion
  remove unused variable
  Add support to travis
  remove ambiguous leading 0's in timestamps whenever we include day portions

Conflicts:
	lib/chronic/parser.rb