Initial support for mbed OS 5.1 (#1318)

- Wrappers for mbed I/O drivers
- Makefile for automating build process
- Script to generate pin definitions from mbed OS source tree
- Updates to js2c to enable building without a main.js file

JerryScript-DCO-1.0-Signed-off-by: Matthew Else Matthew.Else@arm.com

targets/mbedos5/tools/check_pins.sh

@@ -0,0 +1,31 @@
+#!/bin/bash
+
+# Copyright (c) 2016 ARM Limited.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+# If we're checking only for global variable definitions of pins, then
+# file ordering doesn't matter. This is because:
+#
+# var a = b;
+# var b = 7;
+#
+# will be accepted by jshint, just 'a' will evaluate to 'undefined'.
+# Awkward, but at least it means we can have pins.js included at any
+# point in the clump of files and it won't give us false positives.
+
+cat js/*.js | jshint -c tools/jshint.conf - | grep "not defined"
+if [ "$?" == 0 ]; then
+    exit 1
+fi
+exit 0