Make the Cocoa generator use non-hardcoded namespaces.

- Make the Cocoa generator use program->get_namespace("cocoa")
  instead of program->get_cocoa_prefix()
- Eliminate the explicit "cocoa_prefix" in t_program.
- Deprecate the cocoa_prefix token.
- Update example .thrift files and syntax files.


git-svn-id: https://svn.apache.org/repos/asf/incubator/thrift/trunk@665606 13f79535-47bb-0310-9956-ffa450edef68
5 files changed