fix for NOP warning when starting up

I believe this is all that is needed to fix this. I was not able to test completely because of this error during mvn package:

````
Mar 12, 2014 1:06:06 PM com.tobedevoured.naether.impl.NaetherImpl addRemoteRepositoryByUrl
SEVERE: Malformed url: a bad url
java.net.MalformedURLException: no protocol: a bad url
	at java.net.URL.<init>(URL.java:585)
	at java.net.URL.<init>(URL.java:482)
	at java.net.URL.<init>(URL.java:431)
	at com.tobedevoured.naether.util.RepoBuilder.remoteRepositoryFromUrl(RepoBuilder.java:45)
	at com.tobedevoured.naether.impl.NaetherImpl.addRemoteRepositoryByUrl(NaetherImpl.java:345)
	at com.tobedevoured.naether.NaetherTest.addRemoteRepositoryByUrlThatIsMalformed(NaetherTest.java:122)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
````

From what I can tell (Java isn't my strong suit) the Impl is set up to throw the right exception but isn't?