Change prompt format

Add "Firmware" to "Mongoose IoT" ina  couple places.

PUBLISHED_FROM=a0355c45e2ca4db2d2868f0a0f2659c03dac9985

Author: Deomid Ryabkov

fw/src/js/demo.js

@@ -1,4 +1,4 @@
-print('\r\nThis is Mongoose IoT ' + Sys.ro_vars.fw_version + ' (' + Sys.ro_vars.arch + ')\r\n');
+print('\r\nThis is Mongoose IoT Firmware ' + Sys.ro_vars.fw_version + ' (' + Sys.ro_vars.arch + ')\r\n');
 print('Below you should see a JS prompt, feel free to play with it.');
 print('sendRandomData() will send some random data to the cloud.');
 

fw/src/js/sys_init.js

@@ -79,7 +79,7 @@ Object.defineProperty(Sys.conf, "save", {
     }
   }});
 
-print('\nStarting Mongoose IoT - see documentation at',
+print('\nMongoose IoT Firmware - see documentation at',
       'https://cesanta.com/developer/fw',
       '\n==> Sys:\n', Sys, '\n');
 

fw/src/sj_prompt.c

@@ -40,7 +40,7 @@ static void show_prompt(void) {
    */
 
   /* TODO RTOS(alashkin): RTOS printf doesn't support %lu */
-  printf("fw %u/%d$ ", (unsigned int) sj_get_free_heap_size(),
+  printf("[%u/%d] $ ", (unsigned int) sj_get_free_heap_size(),
          (int) v7_heap_stat(s_sjp.v7, V7_HEAP_STAT_HEAP_SIZE) -
              (int) v7_heap_stat(s_sjp.v7, V7_HEAP_STAT_HEAP_USED));