Antlrv4 Parser Plugin stub.
Gradle Antlr task for generating parser classes. Grammar stub. Added gen folder to .gitignore.
AstBuilder class to create Groovy AST from Antlr v4 generated tree. Groovy.g4 grammar file. Imports, package and class declaration processing stub. Added antlr4-runtime dependency.
Merge branch 'feature/playing_with_astbuilder' into develop
Build script invalid import bug.
Renamed groovy.g4 to Groovy.g4.
Make classes compilable. Module field setting to class nodes. New testcase to compile sources(need manuall class files rewiew.)
Create README.md
ASTComparatorCategory class. Quick hack, that allow's AST comparing. Not nice, not omnipotent, serves it need's.
ASTComparator #1

Use of ASTComparator for testing builded AST's.
Correct token location recognition.
Grammar was rewritten, for unifyed work with locations(Delimiters is not a part of package or import node.)
Merge branch 'feature/ast_comparator'
Merge branch 'feature/ast_comparator' into develop
Classs Modifiers #2. Allow specify any of class modifiers. Check is they are valid.
Resolve #2
Class modifiers. Duplicate modifier and invalid access modifier error messages.
Merge branch 'feature/class_modifiers' into develop
Refactoring. Some warning's eliminated.
Work on class members #3.

Methods, fields and constructors. Still without type declaration, bodyes, initializers and properties.
Class Members #3. Type declaration support. Argument lists for constructors and methods.
Closed #3. Class members issue.
Finish work on "Method body" Closed #7. Initial draft of issue #8, very basic constant expressions.