Setting ssl version fails, update httpi gem to v2.2

[dziemian007]

Setting ssl version fails because of a bug in httpi gem. As it's fixed now, httpi gem version update is required.

require 'savon'
Savon.client(wsdl: 'https://example.endpoint.with.tls/wsdl', ssl_version: :TLSv1).operations

HTTPI::SSLError: SSL_connect returned=1 errno=0 state=SSLv3 read server hello A: sslv3 alert handshake failure
    from /home/kaa/.rvm/gems/ruby-2.0.0-p195@roombeats/gems/httpi-2.1.0/lib/httpi/adapter/httpclient.rb:28:in `rescue in request'
    from /home/kaa/.rvm/gems/ruby-2.0.0-p195@roombeats/gems/httpi-2.1.0/lib/httpi/adapter/httpclient.rb:25:in `request'
    from /home/kaa/.rvm/gems/ruby-2.0.0-p195@roombeats/gems/httpi-2.1.0/lib/httpi.rb:140:in `request'
    from /home/kaa/.rvm/gems/ruby-2.0.0-p195@roombeats/gems/httpi-2.1.0/lib/httpi.rb:106:in `get'
    from /home/kaa/.rvm/gems/ruby-2.0.0-p195@roombeats/gems/wasabi-3.3.0/lib/wasabi/resolver.rb:43:in `load_from_remote'
    from /home/kaa/.rvm/gems/ruby-2.0.0-p195@roombeats/gems/wasabi-3.3.0/lib/wasabi/resolver.rb:33:in `resolve'
    from /home/kaa/.rvm/gems/ruby-2.0.0-p195@roombeats/gems/wasabi-3.3.0/lib/wasabi/document.rb:142:in `xml'
    from /home/kaa/.rvm/gems/ruby-2.0.0-p195@roombeats/gems/wasabi-3.3.0/lib/wasabi/document.rb:160:in `parse'
    from /home/kaa/.rvm/gems/ruby-2.0.0-p195@roombeats/gems/wasabi-3.3.0/lib/wasabi/document.rb:147:in `parser'
    from /home/kaa/.rvm/gems/ruby-2.0.0-p195@roombeats/gems/wasabi-3.3.0/lib/wasabi/document.rb:64:in `soap_actions'
    from /home/kaa/.rvm/gems/ruby-2.0.0-p195@roombeats/gems/savon-2.5.1/lib/savon/client.rb:28:in `operations'
    from (irb):2
    from /home/kaa/.rvm/rubies/ruby-2.0.0-p195/bin/irb:12:in `<main>'

[tjarratt]

Sorry for taking so long to merge this pull request. In the course of merging some other PRs, I bumped the version of HTTPI in the gemspec. Let me know if there's anything else I can do to help!