Initial commit of adding cacert

````
    require "net/https"
    require "uri"

    uri = URI.parse("https://www.google.com/")
    http = Net::HTTP.new(uri.host, uri.port)
    http.use_ssl = true
    request = Net::HTTP::Get.new(uri.request_uri)
    response = http.request(request)
````

The omnibus install of ruby/irb would fail, but works with this patch. See
also
http://www.pburkholder.com/post/74342141646/fixing-sensuapp-openssl-peer-cert-validation-issues
Merge pull request #79 from pburkholder/add_cacert

Initial commit of adding cacert