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-uritemplate/Config.in

@@ -0,0 +1,6 @@
+config BR2_PACKAGE_PYTHON_URITEMPLATE
+	bool "python-uritemplate"
+	help
+	  URI templates.
+
+	  https://uritemplate.readthedocs.org

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

@@ -0,0 +1,5 @@
+# md5, sha256 from https://pypi.org/pypi/uritemplate/json
+md5	1ec31e0d8a2eec72357b2cef4bce5945  uritemplate-3.0.0.tar.gz
+sha256	c02643cebe23fc8adb5e6becffe201185bf06c40bda5c0b4028a93f1527d011d  uritemplate-3.0.0.tar.gz
+# Locally computed sha256 checksums
+sha256	b6408be3e63037044329f4198584d59124e913fcd7845bf8379e7fd9a43aac90  LICENSE

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

@@ -0,0 +1,13 @@
+################################################################################
+#
+# python-uritemplate
+#
+################################################################################
+
+PYTHON_URITEMPLATE_VERSION = 3.0.0
+PYTHON_URITEMPLATE_SOURCE = uritemplate-$(PYTHON_URITEMPLATE_VERSION).tar.gz
+PYTHON_URITEMPLATE_SITE = https://files.pythonhosted.org/packages/cd/db/f7b98cdc3f81513fb25d3cbe2501d621882ee81150b745cdd1363278c10a
+PYTHON_URITEMPLATE_SETUP_TYPE = setuptools
+PYTHON_URITEMPLATE_LICENSE_FILES = LICENSE
+
+$(eval $(python-package))