Remove references to IRC, mailing list. Add wiki, twitter.

Think I got them all.
Rebuild the dist meta files to reflect the mailing list and IRC changes.
Merge branch 'master' into issue/235

Conflicts:
	META.json
	META.yml
Put the IRC channel back.

Discussion at https://github.com/schwern/perl5i/issues/235#issuecomment-14534585
says the IRC channel is still active.
Merge branch 'master' into issue/235

Conflicts:
	META.yml
Merge pull request #236 from schwern/issue/235

Issue/235