Fix uninitialized variable

Caused if the timebase is not specified in stats file. Found by Clang.
Fix ARM asm compilation with Apple assembler
Fix input support from named pipes in Windows
CLI: Avoid redundant 16-bit upconversions in piped raw input

It's not possible to seek in pipes, so if we want to skip frames we have to read and
discard unused ones. It's pointless to do bit-depth upconversions in those frames.
Use 8x16c wrappers with x86 asm functions for 4:2:2 with high bit depth
Remove tools/xyuv.c

It's an old stand-alone application that isn't relevant to x264.
Bump dates to 2014

Also update AUTHORS file and my e-mail address in the headers of various files.