Minor Feature and Bugfix release

Minor Features:

• Improve revnibble handling (TLD+NLD given given -> prefix, missing -> suffix), add related online help
• add support for compressed IPv4 addresses, like 10/8 (#19) (contributed by @grayed)

Fixes:

• Improve autodetection of nibble strings, add additional test cases, triggered by #19

General:

• internal databases: update