Grouped actions into single run commands - saves a bit of space

how come? Not to be rude, just curious - I'm still pretty new to a lot of this stuff. I grouped all the apt-get commands together and then I grouped the easy_install pip and other pip commands together. I built a docker image using the updated dockerfile and then used the new image with an existing Sal PostgreSQL database and everything came up all o.k. 
In the end though it didn't save as much space as I thought it would, only about 30mb so probably not worth it. Moving to debian:wheezy instead of ubuntu as a base works and saves about 70mb. Maybe I'm just a nazi for creating the smallest possible docker containers lol
![screen shot 2014-12-02 at 12 13 43 pm](https://cloud.githubusercontent.com/assets/7887711/5256429/c099395e-7a1c-11e4-8ac0-491411d9a0b7.png)