Add leading 0 for the month

This makes the tests fail on my system, for some reason.
Setup development environment with Composer

I had to add a dev-dependency on doctrine/orm 2.3.4, because it wouldn't
work with 2.4 . I chose 2.3.4 because it is what appears in the
.travis.yml . I removed this requirement from .travis.yml since it is
handled with Composer now.
Merge pull request #90 from greg0ire/ease_contributions

Ease contributions
Add a way to force case insensitivity
force case insensitivity for postgresql users
make the case insensitivity setting injectable
make the case insensitivity configurable
Merge pull request #91 from greg0ire/case_insensitivity

Case insensitivity
alias dev-master to 2.x.x-dev

Make sure people who want the latest dev-master can get it even if they
set ~2.0 as a requirement.
Merge pull request #92 from greg0ire/alias_master_branch

added alias dev-master to 2.x.x-dev
fix typo in property name
Merge pull request #93 from greg0ire/patch-1

fix typo in property name
changed the way to create the entity manager instance in tests
removed doctrin/orm from dev requirements