* Refactor common config out of nginx templates.
* A way to inject custom nginx directives.
Setting the ENV variable `NGINX_INCLUDE_FILE` allows the user to specify a
file, relative to the app folder, which will be inserted into the nginx
server config.
This is useful for e.g. overriding a variable. For example to allow
uploads larger than 1Mb the user could create a file called `nginx.conf`
in their app repo containing: `client_max_body_size 8M;` and then set
`NGINX_INCLUDE_FILE=nginx.conf` in the ENV file.
This builds on #77 so that should be merged first.
This patch changes piku to check the installed node version and leave it
if correct.
It also separates the nodeenv install and the npm install steps.
It will also warn the user if they try to change the node version in a
running app, and tells them to stop and then deploy the app again in
order to update the node version.
Fixes#70.
* Fix node path insert to not clobber env.
* Tighter check on python venv for uwsgi conf.
* Install NODE_VERSION if nodeenv on PATH.
* Document NODE_VERSION setting.
Chris McCormick