* Android client setup documentation
This is a first draft of Android Setup instructions. I expect that these will need some revising and that the formatting of this document will benefit from more tweaking.
We may also want to elaborate on the contents of the "advanced settings" menu ([screenshot](https://i.imgur.com/smsmdQF.png)).
* improve appearance on mobile devices
It was very difficult to satisfy all the library dependencies, particularly for Digital Ocean ("dopy") and pycrypto ("cryptography") on RPM-based distros, particularly with the default version of Python that ships with the 6.x line. These steps allow an end-to-end install (verified on Digital Ocean and EC2) with zero warnings or errors.