Update Buildscript (#138)

• Updates preprocessor checks on the iOS build script to increment the version
• The PBXProject.GetFrameworksBuildPhaseTarget() function the script uses to get the framework GUID which is used to update the .xcodeproj, to link the correct frameworks

Author: Nightsd01

OneSignalExample/Assets/OneSignal/Editor/PostProcessBuildPlayer_iOS.cs

@@ -11,7 +11,7 @@
    using UnityEditor.iOS.Xcode;
    using System.Text;
 
-   #if UNITY_2017_1_OR_NEWER
+   #if UNITY_2017_2_OR_NEWER
       using UnityEditor.iOS.Xcode.Extensions;
    #endif
 
@@ -35,7 +35,7 @@ public static void OnPostProcessBuild(BuildTarget target, string path)
          // UserNotifications.framework is required by libOneSignal.a
          project.AddFrameworkToProject(targetGUID, "UserNotifications.framework", false);
 
-         #if UNITY_2017_1_OR_NEWER && !UNITY_CLOUD_BUILD
+         #if UNITY_2017_2_OR_NEWER && !UNITY_CLOUD_BUILD
 
             var extensionTargetName = "OneSignalNotificationServiceExtension";
             var pathToNotificationService = path + "/" + extensionTargetName;
@@ -123,7 +123,7 @@ public static void OnPostProcessBuild(BuildTarget target, string path)
          File.WriteAllText(projectPath, project.WriteToString());
       }
 
-      #if UNITY_2017_1_OR_NEWER && !UNITY_CLOUD_BUILD
+      #if UNITY_2017_2_OR_NEWER && !UNITY_CLOUD_BUILD
 
          // This function takes a static framework that is already linked to a different target in the project and links it to the specified target
          public static void InsertStaticFrameworkIntoTargetBuildPhaseFrameworks(string staticFrameworkName, string frameworkGuid, string target, ref string contents, PBXProject project) {
@@ -152,7 +152,7 @@ public static void InsertStaticFrameworkIntoTargetBuildPhaseFrameworks(string st
             //add the framework as an additional object in PBXBuildFile objects
             contents = contents.Replace("; fileRef = " + fileRef + " /* " + staticFrameworkName + ".a */; };", "; fileRef = " + fileRef + " /* " + staticFrameworkName + ".a */; };\n\t\t" + frameworkGuid + " /* " + staticFrameworkName + ".a in Frameworks */ = {isa = PBXBuildFile; fileRef = " + fileRef + " /* " + staticFrameworkName + ".a */; };");
 
-            //fild the build phase ID number
+            //find the build phase ID number
             string targetBuildPhaseId = project.GetFrameworksBuildPhaseByTarget(target);
             string[] components = contents.Split(new string[] { targetBuildPhaseId + " /* Frameworks */ = {\n\t\t\tisa = PBXFrameworksBuildPhase;\n\t\t\tbuildActionMask = " }, StringSplitOptions.None);