Add some clarifying text to README about git

The requirement that you need to git commit before things will work
needs to be spelled out.

Change-Id: I70414c7d79a1f1ba1e9dac6e533a72fc289263a2
Related-bug: 1232868
Move base test class out of __init__.py

Change-Id: I7407556f2b276f9db20aeb5a243c5810250b41a4
Remove vim modelines

We're actually looking at removing these from openstack in general.

Change-Id: I0605aab1c011b1f0006383bc8fc8a3dbf143fa4b
Merge "Add some clarifying text to README about git"
Merge "Move base test class out of __init__.py"
Merge "Remove vim modelines"