Make the C# generator use non-hardcoded namespaces.

- Make the C# generator use program->get_namespace("csharp")
  instead of program->get_csharp_namespace()
- Eliminate the explicit "csharp_namespace" in t_program.
- Deprecate the csharp_namespace token.
- Update example .thrift files and syntax files.


git-svn-id: https://svn.apache.org/repos/asf/incubator/thrift/trunk@665611 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/test/ThriftTest.thrift b/test/ThriftTest.thrift
index 94a8548..ddb66e8 100644
--- a/test/ThriftTest.thrift
+++ b/test/ThriftTest.thrift
@@ -2,7 +2,7 @@
 namespace cpp thrift.test
 ruby_namespace Thrift.Test
 perl_package ThriftTest
-csharp_namespace Thrift.Test
+namespace csharp Thrift.Test
 
 enum Numberz
 {