Merge branch 'release-0.5.2'

CHANGELOG.rst

Makefile

data/images/countries/nl.png

data/images/countries/tr.png

data/images/countries/us.png

data/resources/eipstatus.qrc

docs/man/bitmask-root.1.rst

docs/man/bitmask.1.rst

docs/release_checklist.wiki

pkg/linux/bitmask-root

pkg/requirements.pip

relnotes.txt

setup.py

src/leap/bitmask/app.py

src/leap/bitmask/backend.py

src/leap/bitmask/backend_app.py

src/leap/bitmask/config/flags.py

src/leap/bitmask/config/providerconfig.py

src/leap/bitmask/frontend_app.py

src/leap/bitmask/gui/advanced_key_management.py