char_out = function char_out(c, outs) {
		accum[a_count++] = c;
		if (a_count >= 254) flush_char(outs);
	}
This class handles LZW encoding
Adapted from Jef Poskanzer's Java port by way of J. M. G. Elliott.
@author Kevin Weiner (original Java version - kweiner@fmsware.com)
@author Thibault Imbert (AS3 version - bytearray.org)
@author Kevin Kwok (JavaScript version - https://github.com/antimatter15/jsgif)
@version 0.1 AS3 implementation