Add missing all_subjects dom definition into compose object

all_subjects was not defined in gmail.dom.compose object's dom method
resulting in updating subject to throw an error. Fixes #98

Add ability to enter to values

Revert "Fixing bug where you couldn't set subject on compose view"

This reverts commit 34e158ebf4c51bb3f3fda2e4afb2d7bb75a251eb.
Merge branch 'master' of github.com:HothouseLabs/gmail.js