Improve Js2C converter (#1408)

* Rename 'jerry_targetjs.h' to 'jerry-targetjs.h',
   because we use dashes in filen ames instead of underscores.
 * Made destination and js souce directory configurable.
 * Updated esp8266 target to the recent changes.
 * Updated mbed and mbedos5 target to the recent changes.

JerryScript-DCO-1.0-Signed-off-by: László Langó llango.u-szeged@partner.samsung.com

targets/mbed/readme.md

@@ -43,7 +43,7 @@ Basically, you can create a new target in this way (If the mbed OS support your
   You can run this rule with the following command: 
   - `make -f targets/mbed/Makefile.mbed board=$(TARGET) jerry`
 
-2. The next rule is the `js2c`. This rule calls a `js2c.py` python script from the `jerryscript/targets/tools` and creates the JavaScript builtin file into the `targets/mbed/source/` folder. This file is the `jerry_targetjs.h`. You can run this rule with the follwoing command:
+2. The next rule is the `js2c`. This rule calls a `js2c.py` python script from the `jerryscript/targets/tools` and creates the JavaScript builtin file into the `targets/mbed/source/` folder. This file is the `jerry-targetjs.h`. You can run this rule with the follwoing command:
 
   - `make -f targets/mbed/Makefile.mbed board=$(TARGET) js2c`
 

targets/mbed/source/main.cpp

@@ -19,7 +19,7 @@
 #include "jerry-core/jerry-api.h"
 #include "jerry_run.h"
 
-#include "jerry_targetjs.h"
+#include "jerry-targetjs.h"
 
 static Serial pc (USBTX, USBRX); //tx, rx