Update NEWS for Vanilla Ice

Summary: We released HHVM 3.4.0 which included Vanilla Ice. Update NEWS for it.

Reviewed By: @ottoni

Differential Revision: D1691048

Signature: t1:1691048:1416426980:3c4af5b888b38e42367b9c2d49e6b2e56ee91853
Add lz4 compression when saving server state.

Reviewed By: @elgenie

Differential Revision: D1689677

Signature: t1:1689677:1416370871:a25c3855816085332025d51c27ae6dd759e75e35