layers: upgrade to latest

Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>
layers.txt: Switch to dizzy branches

Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>
bblayers: Add meta-python

Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>
layers.txt: bump oe-core, meta-oe, meta-qt5 and meta-smartphone a bit

* includes qt5 upgrade to 5.4

Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>
Set BRANCH_COMMON correctly to unstable

Signed-off-by: Simon Busch <morphis@gravedo.de>