ASF License Header

Changed source files to include ASF license statement rather than copyright. See this [guide](http://www.apache.org/legal/src-headers.html) from ASF legal for more details.

:warning: Files in the [com.maxmind.geoip](https://github.com/brooklyncentral/brooklyn/tree/master/core/src/3rd/maxmind/GeoIPJava-1.2.8/source/com/maxmind/geoip) package appear to be **LGPL** licensed.