Installing on Ubuntu

[jkruse]

Just installed Pynab on a fresh Ubuntu Desktop 15.10. Not without a few problems.

First of all, building webui does not work if the install guide is followed top to bottom. Earlier the pynab dir was chown'ed to www-data, which makes 'npm install' fail miserably. Webui install guide works if you chown pynab back to yourself first, then chown it back to www-data after (probably need to do that to rebuild it too).

Second, to run prebot, a few things seem to be missing from requirements.txt. I had to add 'inflect', 'more_itertools' and 'jaraco.classes' before it would run.

Finally, it would be nice if the install guide mentioned how to start nginx/uwsgi. A small thing maybe, but it's just a step that is not mentioned and might not be obvious.