Tweaked TU Darmstadt ShibHttpClient to deal with HTTP tunnel proxies.
- Switched to CloseableHttpClient to gain access to JVM proxy settings
- Switched to HttpRequest (from HttpUriRequest) to cope with
BasicHttpRequest objects
Cleaned up unused classes
Tweaked comment
Some source indenting
Merge pull request #1 from spaetow/master

Tweaked shib-http-client to deal with HTTP tunnel proxies.