wild-billy/SS99 — pull request #1 by RemieRichards (2014-11-01 01:40:05+00:00)
Title: Keywords

## Adds:
* XOR
* EQUAL
* NOT_EQUAL
* PLUS - (+= as this is the expected meaning of PLUS, "2 PLUS 2 is 4")
* MINUS - (-= as this is the expected meaning of MINUS, "4 MINUS 2 is 2")
* PARENT_CALL

Updates current files to use these.