Upgrade iOS deployment target to 9.0 (#2641)

* Upgrade iOS deployment target to 9.0

* Upgrade iOS deployment target to 9.0

* Upgrade iOS deployment target to 9.0
diff --git a/Podfile b/Podfile
index 1fe726b..5dca1b5 100644
--- a/Podfile
+++ b/Podfile
@@ -1,5 +1,5 @@
 source 'https://github.com/CocoaPods/Specs.git'
-platform :ios, '8.0'
+platform :ios, '9.0'
 #inhibit_all_warnings!
 
 def common
diff --git a/WeexDemo.xcodeproj/project.pbxproj b/WeexDemo.xcodeproj/project.pbxproj
index 781aa06..06a0db7 100644
--- a/WeexDemo.xcodeproj/project.pbxproj
+++ b/WeexDemo.xcodeproj/project.pbxproj
@@ -463,6 +463,7 @@
 			developmentRegion = English;
 			hasScannedForEncodings = 0;
 			knownRegions = (
+				English,
 				en,
 				Base,
 			);
@@ -735,7 +736,7 @@
 				GCC_WARN_UNINITIALIZED_AUTOS = YES_AGGRESSIVE;
 				GCC_WARN_UNUSED_FUNCTION = YES;
 				GCC_WARN_UNUSED_VARIABLE = YES;
-				IPHONEOS_DEPLOYMENT_TARGET = 8.0;
+				IPHONEOS_DEPLOYMENT_TARGET = 9.0;
 				MTL_ENABLE_DEBUG_INFO = YES;
 				ONLY_ACTIVE_ARCH = YES;
 				SDKROOT = iphoneos;
@@ -774,7 +775,7 @@
 				GCC_WARN_UNINITIALIZED_AUTOS = YES_AGGRESSIVE;
 				GCC_WARN_UNUSED_FUNCTION = YES;
 				GCC_WARN_UNUSED_VARIABLE = YES;
-				IPHONEOS_DEPLOYMENT_TARGET = 8.0;
+				IPHONEOS_DEPLOYMENT_TARGET = 9.0;
 				MTL_ENABLE_DEBUG_INFO = NO;
 				SDKROOT = iphoneos;
 				TARGETED_DEVICE_FAMILY = "1,2";
@@ -799,7 +800,7 @@
 				);
 				GCC_TREAT_WARNINGS_AS_ERRORS = NO;
 				INFOPLIST_FILE = WeexDemo/Info.plist;
-				IPHONEOS_DEPLOYMENT_TARGET = 8.0;
+				IPHONEOS_DEPLOYMENT_TARGET = 9.0;
 				LD_RUNPATH_SEARCH_PATHS = "$(inherited) @executable_path/Frameworks";
 				OTHER_LDFLAGS = (
 					"$(inherited)",
@@ -829,7 +830,7 @@
 				);
 				GCC_TREAT_WARNINGS_AS_ERRORS = NO;
 				INFOPLIST_FILE = WeexDemo/Info.plist;
-				IPHONEOS_DEPLOYMENT_TARGET = 8.0;
+				IPHONEOS_DEPLOYMENT_TARGET = 9.0;
 				LD_RUNPATH_SEARCH_PATHS = "$(inherited) @executable_path/Frameworks";
 				OTHER_LDFLAGS = (
 					"$(inherited)",
@@ -847,7 +848,7 @@
 			buildSettings = {
 				BUNDLE_LOADER = "$(TEST_HOST)";
 				INFOPLIST_FILE = WeexDemoTests/Info.plist;
-				IPHONEOS_DEPLOYMENT_TARGET = 8.0;
+				IPHONEOS_DEPLOYMENT_TARGET = 9.0;
 				LD_RUNPATH_SEARCH_PATHS = "$(inherited) @executable_path/Frameworks @loader_path/Frameworks";
 				PRODUCT_BUNDLE_IDENTIFIER = com.taobao.WeexDemoTests;
 				PRODUCT_NAME = "$(TARGET_NAME)";
@@ -860,7 +861,7 @@
 			buildSettings = {
 				BUNDLE_LOADER = "$(TEST_HOST)";
 				INFOPLIST_FILE = WeexDemoTests/Info.plist;
-				IPHONEOS_DEPLOYMENT_TARGET = 8.0;
+				IPHONEOS_DEPLOYMENT_TARGET = 9.0;
 				LD_RUNPATH_SEARCH_PATHS = "$(inherited) @executable_path/Frameworks @loader_path/Frameworks";
 				PRODUCT_BUNDLE_IDENTIFIER = com.taobao.WeexDemoTests;
 				PRODUCT_NAME = "$(TARGET_NAME)";
@@ -890,7 +891,7 @@
 				);
 				GCC_TREAT_WARNINGS_AS_ERRORS = NO;
 				INFOPLIST_FILE = "WeexUITestDemo-Info.plist";
-				IPHONEOS_DEPLOYMENT_TARGET = 8.0;
+				IPHONEOS_DEPLOYMENT_TARGET = 9.0;
 				LD_RUNPATH_SEARCH_PATHS = "$(inherited) @executable_path/Frameworks";
 				MODULE_NAME = NO;
 				OTHER_LDFLAGS = (
@@ -920,7 +921,7 @@
 				GCC_INSTRUMENT_PROGRAM_FLOW_ARCS = YES;
 				GCC_TREAT_WARNINGS_AS_ERRORS = NO;
 				INFOPLIST_FILE = "WeexUITestDemo-Info.plist";
-				IPHONEOS_DEPLOYMENT_TARGET = 8.0;
+				IPHONEOS_DEPLOYMENT_TARGET = 9.0;
 				LD_RUNPATH_SEARCH_PATHS = "$(inherited) @executable_path/Frameworks";
 				MODULE_NAME = NO;
 				OTHER_LDFLAGS = (