Merge branch 'master' into develop

* master:
  joined() seems to be much more efficient than reduce()

Sources/StringBuilder.swift

@@ -26,7 +26,7 @@ open class StringBuilder {
      :return: String
      */
     open func toString() -> String {
-        return buffer.reduce("", +)
+        return buffer.joined()
     }
 
     /**

SwiftSoup.podspec

@@ -8,7 +8,7 @@
 
 Pod::Spec.new do |s|
   s.name             = 'SwiftSoup'
-  s.version          = '2.3.0'
+  s.version          = '2.3.1'
   s.summary          = 'Swift HTML Parser / Reader, XML , with best of DOM, CSS, and jquery'
   s.description      = <<-DESC
 SwiftSoup is a Swift library for working with real-world HTML. It provides a very convenient API for extracting and manipulating data, using the best of DOM, CSS, and jquery-like methods.