Program specification draft.
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.)
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'