Warning if pods are not installed and for old CocoaPods versions

NativeScript/nativescript-cli#949

Author: Fatme Havaluova

declarations.d.ts

@@ -316,12 +316,14 @@ interface ISysInfoData {
 	androidInstalled: boolean;
 	/** mono version, relevant on Mac only **/
 	monoVer: string;
-	/** git version string, as retunrnes by `git --version` **/
+	/** git version string, as returned by `git --version` **/
 	gitVer: string;
-	/** gradle version string as retunrnes by `gradle -v` **/
+	/** gradle version string as returned by `gradle -v` **/
 	gradleVer: string;
-	/** javac version string as retunrnes by `javac -version` **/
+	/** javac version string as returned by `javac -version` **/
 	javacVersion: string;
+	/** pod version string, as returned by `pod --version` **/
+	cocoapodVer: string;
 }
 
 interface ISysInfo {

sysinfo.ts

@@ -53,6 +53,8 @@ export class SysInfo implements ISysInfo {
 			res.xcodeVer = this.$hostInfo.isDarwin ? this.exec("xcodebuild -version") : null;
 			res.itunesInstalled = this.$iTunesValidator.getError().wait() === null;
 
+			res.cocoapodVer = this.$hostInfo.isDarwin ? this.exec("pod --version") : null;
+
 			procOutput = this.exec("adb version");
 			res.adbVer = procOutput ? procOutput.split(os.EOL)[0] : null;