Refs /lightbody/browsermob-proxy/issues/39

 - the `setLocalHost()`, as defined, would only ever allow `0.0.0.0`.
 - set the default bind address as `0.0.0.0`, i.e. `localhost`.
 - add option to specify a bind address, see /lightbody/browsermob-proxy/issues/22
Merge branch 'pr/43'

Conflicts:
	src/main/java/net/lightbody/bmp/proxy/ProxyManager.java
a little cleanup from pull request #43