Automatically call removeEmpty for all tokenizer calls

[kpdecker]

Right now implementors need to manually perform something like removeEmpty. This should be done automatically (but overridable) by the logic calling tokenize.

Issue raised in #63

[IonicaBizau]

👍

[kpdecker]

Released in 2.0.0

[IonicaBizau]

Nice! 👍 @kpdecker