Added ANT script to generate the jar file
Changed grammar to accomodate intent of the mute spec, which is :
- new lines have semantic meaning
- conditions, operations and assignations can be in any order and in any cardinality
- there can be only one identifier/name (if there is one)

Also added support for unary - operator and parenthesis in r-value expressions

The demo file now parses without issue!
The only limitation left is that IDs have to be a the beginning of a statement, which is not REQUIRED but encouraged, so I might not bother for now