Use 'use strict'; in generated code too

Makefile

@@ -1,11 +1,15 @@
 .PHONY: test all
 
 GRAMMAR=lib/grammar.pegjs
+PEGJS=./node_modules/.bin/pegjs
 
 all: lib/parser.js
 
-lib/parser.js:
-	./node_modules/pegjs/bin/pegjs $(GRAMMAR) $@
+lib/parser.js: $(PEGJS)
+	 $(PEGJS) $(GRAMMAR) $@
+
+$(PEGJS):
+	npm install
 
 test: lib/parser.js
 	./node_modules/.bin/mocha --check-leaks -R list -u tdd test/*.js

lib/compile.js

@@ -146,6 +146,7 @@ function variables(segments) {
 function compile_pattern(segments) {
   $start();
   $line("return function(binary, env) {");
+  $line("'use strict';");
   $line("var bin = binary, env = env || {};");
   $line("var offset = 0, binsize = bin.length * 8;");
   $line("var bits, result, byteoffset;");
@@ -275,6 +276,7 @@ function emit_write(segments) {
 function compile_ctor(segments) {
   $start();
   $line('return function(bindings) {');
+  $line("'use strict';");
   size_of(segments);
   $line('var buf = new Buffer(buffersize);');
   $line('var offset = 0;');