allow cassandra to find test-cassandra.yaml on windows platform

(on any platform)

without this, on ccw/eclipse/win7 this happens on Console when trying `(tg/open conf)`

```
nREPL server started on port 50275
Fatal configuration error
org.apache.cassandra.exceptions.ConfigurationException: Cannot locate file://S:\workspace.eclipse.2k13_2\titanium/resources/test-
cassandra.yaml
	at org.apache.cassandra.config.DatabaseDescriptor.getStorageConfigURL(DatabaseDescriptor.java:113)
	at org.apache.cassandra.config.DatabaseDescriptor.loadYaml(DatabaseDescriptor.java:130)
	at org.apache.cassandra.config.DatabaseDescriptor.<clinit>(DatabaseDescriptor.java:122)
	at org.apache.cassandra.service.CassandraDaemon.setup(CassandraDaemon.java:150)
	at org.apache.cassandra.service.CassandraDaemon.activate(CassandraDaemon.java:366)
	at org.apache.cassandra.service.CassandraDaemon.main(CassandraDaemon.java:409)
	at com.thinkaurelius.titan.diskstorage.cassandra.embedded.CassandraDaemonWrapper$CassandraStarter.run(CassandraDaemonWrapper.jav
a:64)
	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
	at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:334)
	at java.util.concurrent.FutureTask.run(FutureTask.java:166)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
	at java.lang.Thread.run(Thread.java:722)
Cannot locate file://S:\workspace.eclipse.2k13_2\titanium/resources/test-cassandra.yaml
Fatal configuration error; unable to start server.  See log for stacktrace.
Subprocess failed
```