eMastecard offline installation

This document describes how one can build an image of the eMastercard application for offline installation.

Preparing the image on a machine with an internet connection.
- Requirements:
  - An internet connection
  - A working eMastercard installation.
- Navigate to the emastercard-upgrade-automation folder then execute the following commands:
```
$ git pull
$ ./setup.py
$ ./setup.py --package-for-offline
```
- The steps above will create a tarball named emastercard-upgrade-automation.tgz in the tmp folder. This tarball can be transferred to and installed on machines without an internet connection.
Installing the image
- Requirements:
  - docker
  - docker-compose
  - NOTE: The old eMastercard installations used these same application, you don't need to reinstall them.
- Copy the installer created in the step above to the target machine.
- Extract the tarball as the follows:
```
$ tar -xzvf emastercard-upgrade-automation.tgz
```
- Go into the created emastercard-upgrade-automation folder and configure the application as you normally do; setting the database password and site_prefix in api/migration-config.yml.
- Install the application as follows:
```
$ ./setup.py --offline
```
- If this is a completely new installation not an update then you should do the following:
```
% sudo docker-compose exec api initialize_database.sh
```
- Once the installation completes go to http://localhost:8000 in your browser to verify that application is up and running. NOTE: For new installations you should proceed with the steps