Merge pull request #540 from ArthurHoaro/doc/update20160414

Update docs from Wiki

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+#Server security
+## php.ini
+PHP settings are defined in:
+- a main configuration file, usually found under `/etc/php5/php.ini`; some distributions provide different configuration environments, e.g.
+    - `/etc/php5/php.ini` - used when running console scripts
+    - `/etc/php5/apache2/php.ini` - used when a client requests PHP resources from Apache
+    - `/etc/php5/php-fpm.conf` - used when PHP requests are proxied to PHP-FPM
+- additional configuration files/entries, depending on the installed/enabled extensions:
+    - `/etc/php/conf.d/xdebug.ini`
+
+### Locate .ini files
+#### Console environment
+```bash
+$ php --ini
+Configuration File (php.ini) Path: /etc/php
+Loaded Configuration File:         /etc/php/php.ini
+Scan for additional .ini files in: /etc/php/conf.d
+Additional .ini files parsed:      /etc/php/conf.d/xdebug.ini
+```
+
+#### Server environment
+- create a `phpinfo.php` script located in a path supported by the web server, e.g.
+    - Apache (with user dirs enabled): `/home/myself/public_html/phpinfo.php`
+    - `/var/www/test/phpinfo.php`
+- make sure the script is readable by the web server user/group (usually, `www`, `www-data` or `httpd`)
+- access the script from a web browser
+- look at the _Loaded Configuration File_ and _Scan this dir for additional .ini files_ entries
+```php
+<?php phpinfo(); ?>
+```
+
+## fail2ban
+`fail2ban` is an intrusion prevention framework that reads server (Apache, SSH, etc.) and uses `iptables` profiles to block brute-force attempts:
+- [Official website](http://www.fail2ban.org/wiki/index.php/Main_Page)[](.html)
+- [Source code](https://github.com/fail2ban/fail2ban)[](.html)
+
+### Read Shaarli logs to ban IPs
+Example configuration:
+- allow 3 login attempts per IP address
+- after 3 failures, permanently ban the corresponding IP adddress
+
+`/etc/fail2ban/jail.local`
+```ini
+[shaarli-auth][](.html)
+enabled  = true
+port     = https,http
+filter   = shaarli-auth
+logpath  = /var/www/path/to/shaarli/data/log.txt
+maxretry = 3
+bantime = -1
+```
+
+`/etc/fail2ban/filter.d/shaarli-auth.conf`
+```ini
+[INCLUDES][](.html)
+before = common.conf
+[Definition][](.html)
+failregex = \s-\s<HOST>\s-\sLogin failed for user.*$
+ignoreregex = 
+```