Merge pull request #433 from smathermather/master

Add pip to requirements list

README.md

@@ -37,6 +37,7 @@ A free, user-friendly, extendable application and [API](http://docs.webodm.org)
 * Install the following applications (if they are not installed already):
  - [Docker](https://www.docker.com/)
  - [Python](https://www.python.org/downloads/)
+ - [Pip](https://pypi.python.org/pypi/pip/)
  - [Git](https://git-scm.com/downloads)
 
 * Windows users have a choice between Docker Toolbox (older product but more tutorials available) and Docker for Windows (more recent version that runs on Microsoft's Hyper-V virtualization engine, recommended by Docker). Docker for Windows users should set up their Docker environment before launching WebODM using the Docker utility in the system tray: 1) make sure Linux containers are enabled (Switch to Linux Containers...), 2) give Docker enough CPUs (default 2) and RAM (>4Gb, 16Gb better but leave some for Windows) by going to Settings -- Advanced, and 3) select where on your hard drive you want virtual hard drives to reside (Settings -- Advanced -- Images & Volumes) .