Implemented Dicarbon and corresponding manipulation methods. Split styles into page/global and meta page/meta global.
Implemented Dicarbon and corresponding manipulation methods. Split styles into page/global and meta page/meta global.

Summary: Clean up Dicarbon API in Iron.

Reviewers: sean

Reviewed By: sean

Differential Revision: http://dev.ef-lang.org/D49

grumply/mop,grumply/mop