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-coverage/Config.in

@@ -0,0 +1,6 @@
+config BR2_PACKAGE_PYTHON_COVERAGE
+	bool "python-coverage"
+	help
+	  Code coverage measurement for Python.
+
+	  https://bitbucket.org/ned/coveragepy

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

@@ -0,0 +1,5 @@
+# md5, sha256 from https://pypi.org/pypi/coverage/json
+md5	af8a2411aba54e2711a9d2ac0a4c3de2  coverage-4.5.1.tar.gz
+sha256	56e448f051a201c5ebbaa86a5efd0ca90d327204d8b059ab25ad0f35fbfd79f1  coverage-4.5.1.tar.gz
+# Locally computed sha256 checksums
+sha256	0d542e0c8804e39aa7f37eb00da5a762149dc682d7829451287e11b938e94594  LICENSE.txt

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

@@ -0,0 +1,14 @@
+################################################################################
+#
+# python-coverage
+#
+################################################################################
+
+PYTHON_COVERAGE_VERSION = 4.5.1
+PYTHON_COVERAGE_SOURCE = coverage-$(PYTHON_COVERAGE_VERSION).tar.gz
+PYTHON_COVERAGE_SITE = https://files.pythonhosted.org/packages/35/fe/e7df7289d717426093c68d156e0fd9117c8f4872b6588e8a8928a0f68424
+PYTHON_COVERAGE_SETUP_TYPE = setuptools
+PYTHON_COVERAGE_LICENSE = Apache-2.0
+PYTHON_COVERAGE_LICENSE_FILES = LICENSE.txt
+
+$(eval $(python-package))