Update IDF to de750e9 and add BLE (espressif#723)

* Update IDF to de750e9

* Add BLE Library submodule

Author: me-no-dev

.gitmodules

@@ -0,0 +1,3 @@
+[submodule "libraries/BLE"]
+	path = libraries/BLE
+	url = https://github.com/nkolban/ESP32_BLE_Arduino.git

.travis.yml

@@ -19,7 +19,9 @@ script:
   - mkdir espressif
   - cd espressif
   - ln -s $TRAVIS_BUILD_DIR esp32
-  - cd esp32/tools
+  - cd esp32
+  - git submodule update --init --recursive
+  - cd tools
   - python get.py
   - export PATH="$HOME/arduino_ide:$TRAVIS_BUILD_DIR/tools/xtensa-esp32-elf/bin:$PATH"
   - which arduino

docs/arduino-ide/debian_ubuntu.md

@@ -13,7 +13,9 @@ Installation instructions for Debian / Ubuntu OS
   mkdir -p ~/Arduino/hardware/espressif && \
   cd ~/Arduino/hardware/espressif && \
   git clone https://github.com/espressif/arduino-esp32.git esp32 && \
-  cd esp32/tools/ && \
+  cd esp32 && \
+  git submodule update --init --recursive && \
+  cd tools && \
   python get.py
   ```
 - Restart Arduino IDE

docs/arduino-ide/fedora.md

@@ -10,7 +10,9 @@ Installation instructions for Fedora
   mkdir -p ~/Arduino/hardware/espressif && \
   cd ~/Arduino/hardware/espressif && \
   git clone https://github.com/espressif/arduino-esp32.git esp32 && \
-  cd esp32/tools/ && \
+  cd esp32 && \
+  git submodule update --init --recursive && \
+  cd tools && \
   python get.py
   ```
 - Restart Arduino IDE

docs/arduino-ide/mac.md

@@ -8,7 +8,9 @@ Installation instructions for Mac OS
   mkdir -p ~/Documents/Arduino/hardware/espressif && \
   cd ~/Documents/Arduino/hardware/espressif && \
   git clone https://github.com/espressif/arduino-esp32.git esp32 && \
-  cd esp32/tools/ && \
+  cd esp32 && \
+  git submodule update --init --recursive && \
+  cd tools && \
   python get.py
   ```
 - If you get the error below. Install the command line dev tools with xcode-select --install and try the command above again:

docs/arduino-ide/opensuse.md

@@ -14,7 +14,9 @@ Installation instructions for openSUSE
   mkdir -p ~/Arduino/hardware/espressif && \
   cd ~/Arduino/hardware/espressif && \
   git clone https://github.com/espressif/arduino-esp32.git esp32 && \
-  cd esp32/tools/ && \
+  cd esp32 && \
+  git submodule update --init --recursive && \
+  cd tools && \
   python get.py
   ```
 - Restart Arduino IDE

docs/esp-idf_component.md

@@ -9,7 +9,9 @@ To use as a component of ESP-IDF
     mkdir -p components && \
     cd components && \
     git clone https://github.com/espressif/arduino-esp32.git arduino && \
-    cd .. && \
+    cd arduino && \
+    git submodule update --init --recursive && \
+    cd ../.. && \
     make menuconfig
   ```
 - ```make menuconfig``` has some Arduino options