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DDMathEvaluator.angleMeasurementMode. Fixes issue #29.
DDMathEvaluator has a new property to specify that the arguments to the trigonometric functions should be interpreted as being in degrees versus radians (the default).
Fix edge case when an operator never correctly resolves
Fixes the error reporting for parsing strings in this form: "3++"
Much more descriptive error codes
More descriptive userInfo when a function fails to resolve
removed uncessary enum
change to an NSError API instead of an NSException API
Moved parsing files to common subfolder, added readme and license