Roll Observatory packages and add a roll script

packages/petitparser/lib/src/lisp/grammar.dart

Index: packages/petitparser/lib/src/lisp/grammar.dart
diff --git a/petitparser/lib/src/lisp/grammar.dart b/packages/petitparser/lib/src/lisp/grammar.dart
similarity index 95%
rename from petitparser/lib/src/lisp/grammar.dart
rename to packages/petitparser/lib/src/lisp/grammar.dart
index 7fc508dcca7cad41b5b67d9cbf52b3d03ffe400e..8e53646c5b895abd7248ca6719838fe00677d246 100644
--- a/petitparser/lib/src/lisp/grammar.dart
+++ b/packages/petitparser/lib/src/lisp/grammar.dart
@@ -1,15 +1,11 @@
-part of lisp;
+part of petitparser.lisp;
 
-/**
- * LISP grammar.
- */
+/// LISP grammar.
 class LispGrammar extends GrammarParser {
   LispGrammar() : super(new LispGrammarDefinition());
 }
 
-/**
- * LISP grammar definition.
- */
+/// LISP grammar definition.
 class LispGrammarDefinition extends GrammarDefinition {
 
   start() => ref(atom).star().end();