Simple Policy Plugin

[nunojusto]

Problem

Solving issue https://github.com/CityOfZion/neo-local/issues/99 ...

Solution

Adding install of SimplePolicy plugin to Dockerfile and to the script that changes versions ...

Checklist

• [x] I have ran the tests locally.
• [x] I branched off of the develop branch and not master.
• [x] I did not change the VERSION file.

[revett]

@nunojusto You have conflicts on this branch, please update.

[revett]

@nunojusto No need to keep the ... 👍