started to work on library for API version 2.0
removed debug code
improved argument checks
added delete definitions
implemented get_file_content
added missing get_ calls
enhanced get and delete calls
implemented POST and PUT calls
return everything, not just the body
added missing URI.escape calls
implemented delete_email_address_from_account
added set_primary_email_address_for_account
Fixed parametrize bug -- hash->querystring conversion shouldn't drop underscores
fixed issue where '_' was replaced
Revert "fixed issue where '_' was replaced"

This reverts commit d8bd98380f151794a916ab6083787f8ca7bc9abf.
Merge branch 'dev_2.0' of https://github.com/wishery/Ruby-ContextIO into wishery-dev_2.0
fixed webhook issue
added connect_token handling
added missing add_oauth_provider
prefixed oauth parameters with provider_