Created Pushover transport, requires testing

Moved print_r references to top for debug

Modified Pushover transport, testing required

Pushover transport, fixed syntax issue

Pushover transport, fixed another syntax issue

Pushover transport, added debug

Pushover transport, updated message code

Pushover transport, debug

Pushover transport, testing new code

Pushover transport, adding more parameters

and adding debug parameters

Pushover transport, added severity level support

Pushover transport, modified severity level code

Pushover transport, updated severity code

Pushover transport, debugging severity level

Pushover transport, more debugging

Pushover transport, debugging sound

Pushover transport, fixed sound syntax issue

Pushover transport, debugging sound API

Pushover transport, adjusted sound code

Updated contributors file to add myself

Updated Alerting doc to include Pushover

Pushover transport, modified code

Pushover transport, fixed syntax error

Pushover transport, removed debug code

Ready for deployment

Pushover transport, updated copyright

doc/Extensions/Alerting.md

@@ -15,6 +15,7 @@ Table of Content:
     - [Slack](#transports-slack)
     - [HipChat](#transports-hipchat)
     - [PagerDuty](#transports-pagerduty)
+    - [Pushover](#transports-pushover)
 - [Entities](#entities)
     - [Devices](#entity-devices)
     - [BGP Peers](#entity-bgppeers)
@@ -265,6 +266,31 @@ That's it!
 
 __Note__: Currently ACK notifications are not transported to PagerDuty, This is going to be fixed within the next major version (version by date of writing: 2015.05)
 
+## <a name="transports-pushover">Pushover</a>
+
+Enabling Pushover support is fairly easy, there are only two required parameters.
+
+Firstly you need to create a new Application (called LibreNMS, for example) in your account on the Pushover website (https://pushover.net/apps)
+
+Now copy your API Token/Key from the newly created Application and setup the transport in your config.php like:
+
+```php
+$config['alert']['transports']['pushover'][] = array(
+                                                    "appkey" => 'APPLICATIONAPIKEYGOESHERE',
+                                                    "userkey" => 'USERKEYGOESHERE',
+                                                    );
+```
+
+To modify the Critical alert sound, add the 'sound_critical' parameter, example:
+
+```php
+$config['alert']['transports']['pushover'][] = array(
+                                                    "appkey" => 'APPLICATIONAPIKEYGOESHERE',
+                                                    "userkey" => 'USERKEYGOESHERE',
+                                                    "sound_critical" => 'siren',
+                                                    );
+```
+
 # <a name="entities">Entities
 
 Entities as described earlier are based on the table and column names within the database, if you are ensure of what the entity is you want then have a browse around inside MySQL using `show tables` and `desc <tablename>`.