Add test application builds to Jenkinsfile (#266)

Added test application job calls as postbuild step. 
Added support for IAR toolchain but not enabling this yet.
Changed environmet check from compiler label to isUnix call.

Jenkinsfile

@@ -9,6 +9,7 @@ def morpheusTargets = [
 // Map morpheus toolchains to compiler labels on Jenkins
 def toolchains = [
   //ARM: "armcc",
+  //IAR: "iar_arm",
   GCC_ARM: "arm-none-eabi-gcc"
   ]
   
@@ -27,17 +28,22 @@ for (int i = 0; i < morpheusTargets.size(); i++) {
   }
 }
 
-/* Jenkins does not allow stages inside parallel execution, 
- * https://issues.jenkins-ci.org/browse/JENKINS-26107 will solve this by adding labeled blocks
- */
-stage "parallel build"
 try {
+  /* Jenkins does not allow stages inside parallel execution, 
+   * https://issues.jenkins-ci.org/browse/JENKINS-26107 will solve this by adding labeled blocks
+   */
+  stage "parallel build"
   // Actually run the steps in parallel - parallel takes a map as an argument, hence the above.
   parallel stepsForParallel
-  
+
+  stage "build testapps"
+  parallel testapp: {
+    build 'ARMmbed/mbed-client-testapp/master'
+  }, cliapp: {
+    build 'ARMmbed/mbed-client-cliapp/master'
+  }, failFast: true
 } catch (err) {
   currentBuild.result = 'FAILURE'
-
 } 
 
 //Create yotta build steps for parallel execution
@@ -47,8 +53,14 @@ try {
         deleteDir()
         dir("mbed-os") {
           checkout scm
-          sh "mbed deploy --protocol ssh"
-          sh "mbed compile --tests -m ${target} -t ${toolchain} -c"
+          // shell script on Unix, batch on Windows
+          if (isUnix()) {
+            sh "mbed deploy --protocol ssh"
+            sh "mbed compile --tests -m ${target} -t ${toolchain} -c"
+          } else {
+            bat "mbed deploy --protocol ssh"
+            bat "mbed compile --tests -m ${target} -t ${toolchain} -c"
+          }
         }
       }
     }