more things i missed in previous commits
add -ea to compile flags
make jump accept an arg
add nop/dump instructions
add empty constructors for stack values/init methods
fix labels generation in StackProgram
add Lexer
add lextest
Merge branch 'master' of github.com:greglo/StackGame

Conflicts:
	src/ox/stackgame/stackmachine/StackMachine.java
	src/ox/stackgame/stackmachine/StackProgram.java
	src/ox/stackgame/stackmachine/instructions/BinOperation.java
	src/ox/stackgame/stackmachine/instructions/Operations.java
	src/ox/stackgame/stackmachine/instructions/SeqOperation.java