Make the PHP generator use non-hardcoded namespaces.

- Make the PHP generator use program->get_namespace("php")
  instead of program->get_php_namespace()
- Eliminate the explicit "php_namespace" in t_program.
- Deprecate the php_namespace token.
- Update example .thrift files and syntax files.


git-svn-id: https://svn.apache.org/repos/asf/incubator/thrift/trunk@745241 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/tutorial/tutorial.thrift b/tutorial/tutorial.thrift
index 2655bcb..1eb83b6 100755
--- a/tutorial/tutorial.thrift
+++ b/tutorial/tutorial.thrift
@@ -47,7 +47,7 @@
  */
 namespace cpp tutorial
 namespace java tutorial
-php_namespace tutorial
+namespace php tutorial
 namespace perl tutorial
 namespace smalltalk.category Thrift.Tutorial