Always return false for Video::Other#exist?

Previously was throwing an error because api_uri was missing
Merge pull request #15 from jordanbyron/other_exist_fix

Always return false for Video::Other#exist? Looks good. Kudos Jordan :)
Added thankyous to readme and added ruby formating for examples
Fixed readme format
Added link to list of contributors
Version bump and dependency management
Restore Video#exist? method

Was failing due to api_uri being parsed as a generic URI which caused
problems when passed to Net::HTTP.get_response. Since the specs were
using stubs they didn't catch the problem.

We could probably add VCR to stub out the interactions but since this is
so simple I'm not sure it's even necessary.
Merge pull request #16 from jordanbyron/exist_fix

Restore Video#exist? method
Fixed https prefix for url