generalize tokenizer so can use for parsing s-expressions, also
Merge branch 'master' of https://github.com/langdon-holly/langdonMath-java

Conflicts:
	build/langdon/math/Context.class
	build/langdon/math/ExprParser.class
	src/langdon/math/Context.java
	src/langdon/math/ExprParser.java
	src/mathClasses.txt
Merge branch 'master' of https://github.com/langdon-holly/langdonMath-java