make block builder and construct_runtime! generic over inherent-data (#1191)

* make block builder generic over inherent-data

* construct_runtime has you specify inherent data type

* get all tests to compile

substrate/node/primitives/src/lib.rs

@@ -38,6 +38,8 @@ use runtime_primitives::generic;
 use primitives::bytes;
 use runtime_primitives::traits::{BlakeTwo256, self};
 
+pub use runtime_primitives::BasicInherentData as InherentData;
+
 /// An index to a block.
 pub type BlockNumber = u64;