[Issue #568] Updated travis-ci to Xcode 6.4 and added iOS 8.4 tests to matrix.

.travis.yml

@@ -1,13 +1,14 @@
 language: objective-c
-osx_image: beta-xcode6.3
+osx_image: xcode6.4
 env:
   global:
   - LC_CTYPE=en_US.UTF-8
   - LANG=en_US.UTF-8
   matrix:
-    - DESTINATION="OS=8.1,name=iPhone 5S" SCHEME="Alamofire iOS" SDK=iphonesimulator8.3 BUILD_EXAMPLE="YES" POD_LINT="NO"
-    - DESTINATION="OS=8.2,name=iPhone 6" SCHEME="Alamofire iOS" SDK=iphonesimulator8.3 BUILD_EXAMPLE="YES" POD_LINT="NO"
-    - DESTINATION="OS=8.3,name=iPhone 6 Plus" SCHEME="Alamofire iOS" SDK=iphonesimulator8.3 BUILD_EXAMPLE="YES" POD_LINT="NO"
+    - DESTINATION="OS=8.1,name=iPhone 5" SCHEME="Alamofire iOS" SDK=iphonesimulator8.4 BUILD_EXAMPLE="YES" POD_LINT="NO"
+    - DESTINATION="OS=8.2,name=iPhone 5S" SCHEME="Alamofire iOS" SDK=iphonesimulator8.4 BUILD_EXAMPLE="YES" POD_LINT="NO"
+    - DESTINATION="OS=8.3,name=iPhone 6" SCHEME="Alamofire iOS" SDK=iphonesimulator8.4 BUILD_EXAMPLE="YES" POD_LINT="NO"
+    - DESTINATION="OS=8.4,name=iPhone 6 Plus" SCHEME="Alamofire iOS" SDK=iphonesimulator8.4 BUILD_EXAMPLE="YES" POD_LINT="NO"
     - DESTINATION="arch=x86_64" SCHEME="Alamofire OSX" SDK=macosx10.10 BUILD_EXAMPLE="NO" POD_LINT="YES"
 before_install:
   - gem install cocoapods --no-rdoc --no-ri --no-document --quiet