gitignore updated
Some documentation / warning updates
Code made more testable
X_FLOOR added
Merge branch 'master' of https://github.com/triple-j/XLS-XML-Formula-Expander into triple-j-master

Conflicts:
	XXLS.php
Readability formatting
Range code drastically improved, general cleanup, aggregate operations now accept multi-dimension arrays
Composer/basic unit test added
Index cleanup
left over debug code
Float matching loosened for fast generation
Crappy #REF! handling added
Bad equation lazy fixes
FAST MODE ENABLED
Code formatting
unit test cleanup