Technical upgrade and new features

[guihome-diaz]

Hi,

Thanks a lot for your API ! This is very helpful, and I am happy to use it for my projects.

I did some changes to your base code:

• Upgrade to Java 8 (only in POM, I didn't change the core classes)
• I added a "singleton" like pattern for the applications that don't use Spring or equivalent. It will avoid reloading the library at runtime
• I added the option to load multiple files at once, this can come in handy for some projects of ours
• I added a toString() to the GeoName class to display the "city [country]". we don't care about a detailed position
• I added unit tests. Coverage jumped from 0% to 94% ;)
• I added some Travis and Codacy configuration

Don't hesitate to contact me back and react if you have questions. I'm sorry for the ugly merge quality, I forgot to remove my Eclipse "save actions".

Have a nice day,
GuiHome