ESYS_LIB_PATH:
	- new constant that defines the path to the esys lib directory - useful for when the framework is installed with composer
	- updating all calculations of a relative lib path to check for ESYS_LIB_PATH constant first

ESys_Autoloader:
	- adding a method to define the ESYS_LIB_PATH constant
updating unit tests to work with phpunit 3.7
ESys_WebControl_ResponseFactory: build method can accept a single content argument instead of an array of values. fixes #9
ESys_WebControl_FrontControllerTest: fixes issue related to new testing autoloader