Python images on Alpine Linux

Python docker images on alpine linux.

Inspireded from @amancevice, @jfloff and @gliderlabs

Miniconda inspireded from frol

Images list

image	version	Dockerfiles
python	2, latest	(2/Dockerfile)
	3	(3/Dockerfile)
pandas	0.19-2, latest	(0.19/2/Dockerfile)
	0.19-3	(0.19/3/Dockerfile)
	0.18-2	(0.18/2/Dockerfile)
	0.18-3	(0.18/3/Dockerfile)
scipy	2, latest	(2/Dockerfile)
	3	(3/Dockerfile)
pocad	2, latest	(2/Dockerfile)
	3	(3/Dockerfile)
pluck	2, latest	(2/Dockerfile)
	3	(3/Dockerfile)