Update POM
Completely rewrite grammar and AST
Add some tests for AST
Rename Visitor to RSQLVisitor
Drop visit methods for supernodes from RSQLVisitor and change AbstractVisitor
Setup Coveralls and add badge to README
Introduce RSQLNodesFactory for nodes creation
Change ComparisonNode#getOperator() to String and make it abstract
Allow to use custom RSQLNodesFactory
Add an optional argument to visitor
Introduce NoArgRSQLVisitorAdapter
Update readme
Replace IAE with specialized UnknownOperatorException
Update readme
Update README.md

Show some examples and other small feel-good changes.
Give back alternative notation for logical operators
Release v2.0.M1