plug PasswordRequirements validator
add file header
make it work with a null value
add some tests

- use the new AbstractConstraintValidatorTest for testing
- remove testing for dead versions (<2.3)
Merge pull request #15 from rollerworks/15-add-passwordrequirements-validator

feat #15 add PasswordRequirements validator (sstok)

This PR was merged into rollerworks:master branch.

Discussion
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Updated validator of the https://github.com/jbafford/PasswordStrengthBundle.

Todo:

- [ ] Tests
- [x] CS (missing headers)
- [ ] Documentation

Commits
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85ac47bc0b8b176132348918cce68b97044cd3ee plug PasswordRequirements validator (sstok)
6464ae9dbd4e95bd53d348fc43ff483878e14035 add file header (sstok)
06bc6eb4079627116433ea202310d7ea58d5f350 make it work with a null value (sstok)
220bd30d0a993c564fcbf51218804af1f9343ae3 add some tests

- use the new AbstractConstraintValidatorTest for testing
- remove testing for dead versions (<2.3) (sstok)