Style tweaks.
Add support for direct play of MKV, behind a version check.
Revert "Update Makefile and README for recent changes."

This reverts commit 5ef336c7436f0b5f665353254536ff8e91a0c787.
Check ref frames before direct playing MKV, fixes #256.
Check bit depth before direct playing MKV, fixes #253.
Wake the Roku when playing something remotely, fixes #252.