Updated so headers can be set individually by teh strategy, allowing different post types, multi-part mim-content, different methods, etc.
Improved Error Handling in CdnRouterExecutor
Set InvocationHandler to always use POST method, and allow for additional headers.
Merge pull request #12 from kpartlow/master

Added in add additional headers to the InvocationHandlerStrategy to allow setting of the content-type for integration projects