Added Ant build folders to .gitignore
Build fails if grammar compilation fails
Generate grammars in a separate intermediate build output folder
Include generated grammars in source zip for debugging purposes
Pass the -Xlint -Xlint:-serial options to javac
Faster build if we don't fork the ANTLR task
Improve build performance avoiding an unnecessary directory copy
Specify input and library directories for in-process execution of ANTLR Tool
tweak for final lib ref