Revert "Add flag for unknown types"

This reverts commit 4b8796f189d15fc611cd15f319d2d1fd54572048.
Pull closure annotations back out

Revert "Merge branch 'closure' into gh-pages"

This reverts commit 8012cec69587dd8027fb7157a126e1e128372741, reversing
changes made to 584b67ebbfcd95d03e040b05369bcfb8ba623099.
Remove typeChecker