Added ./bin/ to ignored directories.
[WIP]Added demo programs.
Changed port to SSDP and test listener to listen in a loop.
Added DeviceDescriptionMessage interface.

It's an interface that is used to group and handle all message types
that contain device description related things such as XML description
location and USN.
Removed non-utf-8 characters that broke build.
Improved UUIDGeneratorTest.

Test now assumes there is a network interface with a MAC address,
because sometimes it fails to retrieve, and it failed the test,
eventhough the code was correct.
Updated required junit version to the one supporting assumes.
Included plugin version into pom files.

Maven 3 issues a warning when plugin version is not explicitly
specified.
Merge branch 'luk32-master'
Merge branch 'master' of https://github.com/antmicro/jerabi-ssdp

Conflicts:
	ssdp-core/src/main/java/com/jerabi/ssdp/sender/SSDPPeriodicMessageSender.java