microbit-samples: removed default config.json, moved from rc3 to rc4

A default config.json confused users when try to set option using
MicroBitConfig.h.

This patch removes the default, and thus enforces a user to make
a conscious decision around whether to use yotta config, or MicroBitConfig.h

README.md

@@ -23,6 +23,56 @@ In addition to supporting development in C/C++, the runtime is also designed spe
 | ARM mbed online | http://lancaster-university.github.io/microbit-docs/online-toolchains/#mbed |
 | yotta  | http://lancaster-university.github.io/microbit-docs/offline-toolchains/#yotta |
 
+##  microbit-dal Configuration
+
+To configure the DAL a number options can be modified in `MicroBitConfig.h`, a full list and explanation
+can be found in our [documentation](http://lancaster-university.github.io/microbit-docs/advanced/#compile-time-options-with-microbitconfigh).
+
+Alternately, `yotta` can be used to configure the dal regardless of module/folder structure, through providing a
+`config.json` in this directory.
+
+Here is an example of `config.json` with all available options configured:
+```json
+{
+    "microbit-dal":{
+        "bluetooth":{
+            "enabled": 1,
+            "pairing_mode": 1,
+            "private_addressing": 0,
+            "open": 0,
+            "whitelist": 1,
+            "advertising_timeout": 0,
+            "tx_power": 0,
+            "dfu_service": 1,
+            "event_service": 1,
+            "device_info_service": 1
+        },
+        "reuse_sd": 1,
+        "default_pullmode":"PullDown",
+        "gatt_table_size": "0x300",
+        "heap_allocator": 1,
+        "nested_heap_proportion": 0.75,
+        "system_tick_period": 6,
+        "system_components": 10,
+        "idle_components": 6,
+        "use_accel_lsb": 0,
+        "min_display_brightness": 1,
+        "max_display_brightness": 255,
+        "display_scroll_speed": 120,
+        "display_scroll_stride": -1,
+        "display_print_speed": 400,
+        "panic_on_heap_full": 1,
+        "debug": 0,
+        "heap_debug": 0,
+        "stack_size":2048,
+        "sram_base":"0x20000008",
+        "sram_end":"0x20004000",
+        "sd_limit":"0x20002000",
+        "gatt_table_start":"0x20001900"
+    }
+}
+```
+
 ## BBC Community Guidelines
 
 [BBC Community Guidelines](https://www.microbit.co.uk/help#sect_cg)

config.json

@@ -1,37 +0,0 @@
-{
-    "microbit-dal":{
-        "bluetooth":{
-            "enabled": 1,
-            "pairing_mode": 1,
-            "private_addressing": 0,
-            "open": 0,
-            "whitelist": 1,
-            "advertising_timeout": 0,
-            "tx_power": 0,
-            "dfu_service": 1,
-            "event_service": 1,
-            "device_info_service": 1
-        },
-        "reuse_sd": 1,
-        "gatt_table_size": "0x300",
-        "heap_allocator": 1,
-        "nested_heap_proportion": 0.75,
-        "system_tick_period": 6,
-        "system_components": 10,
-        "idle_components": 6,
-        "use_accel_lsb": 0,
-        "min_display_brightness": 1,
-        "max_display_brightness": 255,
-        "display_scroll_speed": 120,
-        "display_scroll_stride": -1,
-        "display_print_speed": 400,
-        "panic_on_heap_full": 1,
-        "debug": 0,
-        "heap_debug": 0,
-        "stack_size":2048,
-        "sram_base":"0x20000008",
-        "sram_end":"0x20004000",
-        "sd_limit":"0x20002000",
-        "gatt_table_start":"0x20001900"
-    }
-}

module.json

@@ -1,6 +1,6 @@
 {
   "name": "microbit-samples",
-  "version": "2.0.0-rc3",
+  "version": "2.0.0-rc4",
   "description": "The micro:bit runtime common abstraction with examples.",
   "license": "MIT",
   "dependencies": {