Wrapped the ffmpeg configure options onto multiple lines, and removed a duplicate cflags option.
Bumped multiple libraries:
	ffmpeg     2.1.4 -> 2.3.1
	libpng15  1.5.14 -> 1.5.18
	libogg     1.3.1 -> 1.3.2
	libvorbis  1.3.3 -> 1.3.4
	libvpx     1.1.0 -> 1.3.0
	x264         ??? -> 20140809-2245
	xvidcore   1.3.2 -> xvidcore-1.3.3
Made fetchurl support zip files.
Swithed from using faac to libfdk_aac.