- upgrade libraries

- add - (NSString*) stringByStrippingHTML

Example/Podfile

@@ -1,5 +1,6 @@
 source 'https://github.com/CocoaPods/Specs.git'
 use_frameworks!
+platform :ios, '9.0'
 
 target 'NSString-Helper_Example' do
     pod "NSString-Helper", :path => "../"
@@ -9,4 +10,4 @@ target 'NSString-Helper_Tests' do
     pod "NSString-Helper", :path => "../"
     
     pod 'FBSnapshotTestCase'
-end
+end