Add license header during make dist

LICENSE

@@ -0,0 +1,22 @@
+MIT License
+
+Copyright (C) 2011, Twilio, Inc. <help at twilio dot com>
+Copyright (C) 2011, Neuman Vong <neuman at twilio dot com>
+
+Permission is hereby granted, free of charge, to any person obtaining a copy of
+this software and associated documentation files (the "Software"), to deal in
+the Software without restriction, including without limitation the rights to
+use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
+of the Software, and to permit persons to whom the Software is furnished to do
+so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

Makefile

@@ -1,13 +1,38 @@
 # Twilio API helper library.
 # See LICENSE file for copyright and license details.
 
-all: dist test
+define LICENSE
+<?php
 
-dist:
-	@echo creating package
+/**
+ * Twilio API helper library.
+ *
+ * @category  Services
+ * @package   Services_Twilio
+ * @author    Neuman Vong <neuman@twilio.com>
+ * @license   http://creativecommons.org/licenses/MIT/ MIT
+ * @link      http://pear.php.net/package/Services_Twilio
+ */
+endef
+export LICENSE
+
+all: test
+
+clean:
+	@rm -rf dist
+
+PHP_FILES = `find dist -name \*.php`
+dist: clean
+	@mkdir dist
+	@git archive master | (cd dist; tar xf -)
+	@for php in $(PHP_FILES); do\
+	  echo "$$LICENSE" > $$php.new; \
+	  tail -n+2 $$php >> $$php.new; \
+	  mv $$php.new $$php; \
+	done
 
 test:
 	@echo running tests
 	@phpunit --configuration tests/phpunit.xml
 
-.PHONY: all dist test
+.PHONY: all clean dist test