SpringController redirect should be context-relative

[lhazlewood]

It is not context relative currently, so if the web-app is deployed under a non-root context path (e.g. /foo), then redirects will fail.

The workaround is to change various stormpath.web.*.nextUri property values to have the context-path in them, which isn't ideal.

[dogeared]

@lhazlewood - Is this a dup of #210?

[mraible]

@dogeared I believe so. I believe you can close this issue based on my findings in #210 (comment).