After spending a lot of time finding why my app won't run, just noticed that the gitignore I copied introduced a deletion/ignore rule of an internal folder used by the framework.
The current gitignore file deletes the folder `/system/Cache/*` and causes the following error when running the App from the CLI or the web server : `Class "CodeIgniter\Cache\CacheFactory" not found `; making the app unable to run.

I added the following rule to fix this : `!system/Cache/*`.

Note : this won't fix the bug if the system folder is renamed

- Added lines from the zip of Codeigniter-3.1.2

Some files don't contain a line separator ('\n') at the end. Add the
missing eol.

In POSIX, all lines of text should end with a newline character by
definition. See
http://pubs.opengroup.org/onlinepubs/9699919799/basedefs/V1_chap03.html
section 3.397 for more.

See https://gist.github.com/jacknagel/1020172 for a gist of the issue.

Environment support eliminates the need to ignore database.php.  Instead, ignore the entire development dir.
Logs and cache are now in application folder instead of system.