[WIP] Support for User Defined Directives (UDD) (#121)

Implementation of user defined directives (UDD) or custom directives.

Author: nitinmotgi

.gitignore

@@ -33,6 +33,16 @@ logs/
 /data/
 /data-fabric-tests/data/
 
+# ANTLR4
+/core/gen
+*.tokens
+DirectivesLexer.java
+DirectivesParser.java
+DirectivesBaseListener.java
+DirectivesBaseVisitor.java
+DirectivesListener.java
+DirectivesVisitor.java
+
 # generated by docs build
 *.py
 

LICENSE

@@ -39,7 +39,7 @@
 
       "Derivative Works" shall mean any work, whether in Source or Object
       form, that is based on (or derived from) the Work and for which the
-      editorial revisions, annotations, elaborations, or other modifications
+      editorial revisions, co.cask.wrangler.api.annotations, elaborations, or other modifications
       represent, as a whole, an original work of authorship. For the purposes
       of this License, Derivative Works shall not include works that remain
       separable from, or merely link (or bind by name) to the interfaces of,