Update 'base.dockerfile' with updated git

[jeff1evesque]

When attempting to build our base.dockerfile, we get an error:

root@vagrant-ubuntu-trusty-64:/vagrant# docker build  -f dockerfile/base.dockerfile -t jeff1evesque/ml-base:0.7 .
...
Reading package lists...
Building dependency tree...
Reading state information...
E: Version '1:1.9.1-1ubuntu0.7' for 'git' was not found
The command '/bin/sh -c apt-get -y install git=1:1.9.1-1ubuntu0.7 wget=1.15-1ubuntu1.14.04*' returned a non-zero code: 100

Note: this issue is not high priority, since most containers should leverage the dockerhub instance, which has already been committed, and sufficient for use.