* Allow session lifetime to be set in env variables
Currently the session live time defaults to 2 hours, adding an env variable will allow us to change this on a per site basis
* Add whitespace for consistency
* Disable autocomplete on admin email field
Fixes#1165
* Disable autocomplete on admin name and password
For sake of completeness and due to some over zealous autocompleters, also disable it on name and password fields
Andrew Roberts