Formatting fixes.

Summary: Mostly fixes for lines > 80. I have my editor set to wrap lines so
it's kind of annoying.

Reviewed By: @jwatzman

Differential Revision: D1732663

Signature: t1:1732663:1418424495:8551b7528dedf2fba8b62476befced0d315cc40e
Remove unused cache.ml

Reviewed By: @jwatzman

Differential Revision: D1732842

Signature: t1:1732842:1418424718:e29935c3321d75673ef3f1749fc64805c13f72cb
Add a couple of license headers.

Reviewed By: @jwatzman

Differential Revision: D1732831

Signature: t1:1732831:1418424578:eaac1f1e31ad188b8910625f8a22debe90f5d284