JsxTransformer exception now includes whole inner exception, not only message

[mandrek44]

JsxTransformer adds the file name to exception message, however it discards the inner exception details, like stack trace. By including the inner exception in the thrown exception object we don't loose any information.

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[Daniel15]

It looks like you've accidentally sent this pull request from your master branch rather than just the branch with this change, so it's also pulled in the whole OWIN pull request (#69). I'll review it once you update the pull request with the correct branch :)

[mandrek44]

I created new Pull Request: #70