Put the ca file location in the Certified::CA_FILE constant.

Add a VERSION constant while we're at it.
Use a magic number for extra security :lol:
Fix Faraday with default (Net::HTTP) adapter

Besides ca_file Faraday seems to set a `cert_store` to `Net::HTTP`, and it seems to override the setting from ca_file.
cert updated
Merge branch 'master' of https://github.com/Rippeorg/certified
Merge branch 'patch-1' of https://github.com/pirj/certified
Merge branch 'patch-1' of https://github.com/markburns/certified

Conflicts:
	certified.rb