MycroftOS: Implementation of a very first initial bootable version

- Add Buildroot patches to downgrade / upgrade package dependencies
  in line with the Mycroft A.I. software stack requirements.
- Add buildroot additional package dependencies in line with the
  Mycroft A.I. software stack requirements.
- Update rpi3 defconfig file.
- Implement initial root_fs overlay filestructure.
- Addition of some quick and dirty helper scripts.
- Update of README to reflect these changes.

buildroot-external/package/python-pyaudio/Config.in

@@ -0,0 +1,7 @@
+config BR2_PACKAGE_PYTHON_PYAUDIO
+	bool "python-pyaudio"
+	help
+	  Bindings for PortAudio v19, the cross-platform audio
+	  input/output stream library.
+
+	  http://people.csail.mit.edu/hubert/pyaudio/

buildroot-external/package/python-pyaudio/python-pyaudio.hash

@@ -0,0 +1,3 @@
+# md5, sha256 from https://pypi.org/pypi/pyaudio/json
+md5	7e4c88139284033f67b4336c74eda3b8  PyAudio-0.2.11.tar.gz
+sha256	93bfde30e0b64e63a46f2fd77e85c41fd51182a4a3413d9edfaf9ffaa26efb74  PyAudio-0.2.11.tar.gz

buildroot-external/package/python-pyaudio/python-pyaudio.mk

@@ -0,0 +1,14 @@
+################################################################################
+#
+# python-pyaudio
+#
+################################################################################
+
+PYTHON_PYAUDIO_VERSION = 0.2.11
+PYTHON_PYAUDIO_SOURCE = PyAudio-$(PYTHON_PYAUDIO_VERSION).tar.gz
+PYTHON_PYAUDIO_SITE = https://files.pythonhosted.org/packages/ab/42/b4f04721c5c5bfc196ce156b3c768998ef8c0ae3654ed29ea5020c749a6b
+PYTHON_PYAUDIO_SETUP_TYPE = setuptools
+PYTHON_PYAUDIO_LICENSE = 
+
+$(eval $(python-package))
+$(eval $(host-python-package))