Initial error handling support
Error handling overhaul
Error handling overhaul
Added test for v1.3 and updated API docs
Removed getRawMessage() as it is redundant with previous errors now being stored via getPrevious()
Fixed Toolkit to reflect removal of getRawMessage()
Updated API docs
Updated API docs and README
Merge branch 'v1.3'

Conflicts:
	src/PHPSandbox/PHPSandbox.php
Merge branch 'v1.3'

Conflicts:
	src/PHPSandbox/PHPSandbox.php