include license with each package

original commit: ff9da94cfb852d25cd54bc0d9a904c8ae46fe64c

pkgs/parser-tools-pkgs/parser-tools-doc/LICENSE.txt

@@ -0,0 +1,10 @@
+parser-tools-doc
+Copyright (c) 2010-2013 PLT Design Inc.
+
+This package is distributed under the GNU Lesser General Public
+License (LGPL).  This means that you can link Racket into proprietary
+applications, provided you follow the rules stated in the LGPL.  You
+can also modify this package; if you distribute a modified version,
+you must distribute it under the terms of the LGPL, which in
+particular means that you must release the source code for the
+modified software.  See COPYING_LESSER.txt for more information.

pkgs/parser-tools-pkgs/parser-tools-lib/LICENSE.txt

@@ -0,0 +1,10 @@
+parser-tools-lib
+Copyright (c) 2010-2013 PLT Design Inc.
+
+This package is distributed under the GNU Lesser General Public
+License (LGPL).  This means that you can link Racket into proprietary
+applications, provided you follow the rules stated in the LGPL.  You
+can also modify this package; if you distribute a modified version,
+you must distribute it under the terms of the LGPL, which in
+particular means that you must release the source code for the
+modified software.  See COPYING_LESSER.txt for more information.

pkgs/parser-tools-pkgs/parser-tools/LICENSE.txt

@@ -0,0 +1,10 @@
+parser-tools
+Copyright (c) 2010-2013 PLT Design Inc.
+
+This package is distributed under the GNU Lesser General Public
+License (LGPL).  This means that you can link Racket into proprietary
+applications, provided you follow the rules stated in the LGPL.  You
+can also modify this package; if you distribute a modified version,
+you must distribute it under the terms of the LGPL, which in
+particular means that you must release the source code for the
+modified software.  See COPYING_LESSER.txt for more information.