Reinstalling the cache fails every time

[helderm]

Use Case: User wants to clear all data stored in the cache.

To achieve that, I called HttpResponceCache.delete(). Everything worked as expected, but I lost the http cache in the process. After trying to install() again, I received the following exception:

08-04 17:59:37.270: E/AndroidRuntime(328): java.lang.RuntimeException: An error occured while executing doInBackground()
...
08-04 17:59:37.270: E/AndroidRuntime(328): Caused by: java.lang.Error: Attempt to set factory more than once.
08-04 17:59:37.270: E/AndroidRuntime(328): at java.net.URL.setURLStreamHandlerFactory(URL.java:139)
08-04 17:59:37.270: E/AndroidRuntime(328): at com.integralblue.httpresponsecache.HttpResponseCache.install(HttpResponseCache.java:186)

[candrews]

Fixed, see c6f8eef