add overrides to activation keys
use separate columns for different types of contentoverride
updated some comments to reflect new abstract behavior
fix liquibase script for mysql
remove commented code
Add security hole where we validity ourselves

Test that we're verifying consumer uuid when we modify
content overrides
Added principal based security to match verify
javadoc. rename cp_consumer_content_override cp_content_override
Merge pull request #494 from candlepin/ckozak/actkey_overrides

Ckozak/actkey overrides