Move conf.ini and icon_cache.png to standard locs

* ~/.config/$app_name/conf.ini
* ~/.cache/$app_name/icon_cache.png

In case old config file is found it's moved over to a new location,
unless a new file already exists.
Use single method to get config and cache location
Do not ignore any IP that includes 127

e.g. 192.168.0.127 should be presented to the user,
while 127.x.x.x should be ignored
Merge pull request #31 from dotdoom/master

Move conf.ini and icon_cache.png to standard locs