Revert "Merge pull request #12 from leapcode/feature/use-leap_ca-lib"

This reverts commit d2acd205b3c3f0931ce4c453e67b1ba572ec77e9, reversing
changes made to e6496b0f45cc0b487da7cb35a34b8e79037034c0.

Conflicts:
	certs/lib/leap_web_certs/engine.rb