Merge pull request #15 from jamboree/develop

fix transform_params/ fix integer_sequence for clang (reverted from commit 29fea725763e27067f5bdda172d790bd0bda5623)
new facade-based API (reverted from commit 7f7dbe90368a18d977e2c8aea313b0f1e57e016b)
Merge branch 'develop'
removing non-variadics code
ading is_rule trait