Add and start using Checkstyle 5.7

third_party/checkstyle/RIGHTS.antlr

Index: third_party/checkstyle/RIGHTS.antlr
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+
+SOFTWARE RIGHTS
+$Id: RIGHTS.antlr,v 1.1 2001-06-22 13:11:01 oburn Exp $
+
+ANTLR 1989-2000 Developed by jGuru.com (MageLang Institute), 
+http://www.ANTLR.org  and http://www.jGuru.com
+
+We reserve no legal rights to the ANTLR--it is fully in the
+public domain. An individual or company may do whatever
+they wish with source code distributed with ANTLR or the
+code generated by ANTLR, including the incorporation of
+ANTLR, or its output, into commerical software.
+
+We encourage users to develop software with ANTLR. However,
+we do ask that credit is given to us for developing
+ANTLR. By "credit", we mean that if you use ANTLR or
+incorporate any source code into one of your programs
+(commercial product, research project, or otherwise) that
+you acknowledge this fact somewhere in the documentation,
+research report, etc... If you like ANTLR and have
+developed a nice tool with the output, please mention that
+you developed it using ANTLR. In addition, we ask that the
+headers remain intact in our source code. As long as these
+guidelines are kept, we expect to continue enhancing this
+system and expect to make other tools available as they are
+completed.
+
+The primary ANTLR guy:
+
+Terence Parr
+http://www.jGuru.com
+parrt@jguru.com