moved source file into src directory
extracted Count64 class and packXXle() functions into library module
moved ZipStreamer into namespace ZipStreamer
Moved sending of headers to separate method (removed all parameters from constructor)
added option to switch to use arbitrary stream as output
remove unintended exit call
replaced include() with require
allow initialization of Count64 with two integers (for low and high bits)
fixed throwing exceptions for invalid initialization arguments
implemented getHiBytes() and getLoBytes() in Count64 classes
fixed die() messages and buffer cleaning in SendHeaders method
added test suite with basic tests for both ZipStreamer and Count64 library
activated basic travis-ci integration
added php 5.6 to travis-ci configuration
enable fast-finish for travis-ci
changed php://stdout to php://output for CGI SAPI compatibility