also in comments
allow all origins by default, makes things easy
ignore .git
simpler and better Dockerfile

some things should be ONBUILD
some things can be in 1 command for more efficient use of images
make ssh keys optional
remove development tools

deps:
graphite-api : brutasse's version is now the recommended one
graphite-influxdb: has latest fixes in pypi now
influxdb-python: ditto