require openssl if url is https (Kong#123)

Prior to this change, the generated code would throw
`uninitialized constant OpenSSL NameError`

Fixes Kong#97

Author: JPrevost

src/targets/ruby/native.js

@@ -7,7 +7,12 @@ module.exports = function (source, options) {
 
   code.push('require \'uri\'')
       .push('require \'net/http\'')
-      .blank()
+
+  if (source.uriObj.protocol === 'https:') {
+    code.push('require \'openssl\'')
+  }
+
+  code.blank()
 
   // To support custom methods we check for the supported methods
   // and if doesn't exist then we build a custom class for it

test/fixtures/output/ruby/native/https.rb

@@ -1,5 +1,6 @@
 require 'uri'
 require 'net/http'
+require 'openssl'
 
 url = URI("https://mockbin.com/har")