Allow soundcloud https oembeds

soundcloud is using https a lot in their new site and their
oembed endpoint supports it, commit adds support for that.
Merge pull request #30 from Ruxton/patch-1

OEmbed::Providers::SoundCloud accepts https URLs
Update Changelog based on Pull #30
Correct version number in the Changelog

This is what I get for committing via GitHub's web UI :-)
Merge remote-tracking branch 'origin/master' into add_ok_json_backend

Conflicts:
	CHANGELOG.rdoc
Another fix for tests where OkJson fails

Instead of the approach taken in 40bf8a941, where I simply removed the troublesome UTF8 characters, this time I introduced an alternative Flickr URL (that naturally doesn't include non-ASCII characters)

This will let me use the remaining :flickr_utf8 examples to detect if OkJson ever learns to parse those UTF8 characters and also lets me assert that other JSON backends handle them gracefully.
Test our JSON backends with UTF8 decoding

This'll let us know if a future upgrade to OkJson eventually handles the case without error.
Update README to note potential OkJson pitfall