clear playlist if it has been updated for one hour

the reason behind this is URL of the song has expiration time, and
after this time, it is not accessible anymore.
random channel selection
version
readme
Merge pull request #2 from honnix/master

one improvement and one new feature
stupid typo
Merge pull request #3 from honnix/master

a stupid typo that will crash the whole thing
add feature of use web page to show channel list and switch channel