Specified version of r509-validity-redis dependency.
Updated more dependencies.
Updated Gemfile because Travis needs to find the right r509 in Github.
Merge branch 'master' of https://github.com/sirsean/r509-middleware-validity

* 'master' of https://github.com/sirsean/r509-middleware-validity:
  Updated Gemfile because Travis needs to find the right r509 in Github.
  Updated more dependencies.
  Specified version of r509-validity-redis dependency.

Conflicts:
	Gemfile
	r509-middleware-validity.gemspec