Add travis PHP Parse Error checker

This parse error checker is a PHP script that checks the existence of PHP parse Errors in Travis:
https://github.com/redCOMPONENT-COM/redITEM2/blob/develop/.travis/phpparseerrorchecker.php
 
Initially we used 

```sh
- find ./component -name '*.php' -exec php -l {} \;
```

But it generates an endless log in travis that is not very much useful:

```sh
$ find ./component -name '*.php' -exec php -l {} \;
No syntax errors detected in ./administrator/component//views/categories/tmpl/elements.php
No syntax errors detected in ./component/admin/views/categories/tmpl/default.php
No syntax errors detected in ./component/admin/views/categories/view.html.php
...
```
 
After that we thought on:

```sh
- find ./component -name '*.php' -exec php -l {} \; | grep "Parse error";
```

But GREP exits with **exit(0)** if founds a "parse error" and with **exit(1)** if it doesn't found, witch is exactly the opposite that we need to make Travis fail when there is a Parse error.

So the proposal is /.travis/phppec.php takes control of the exit code and makes Travis fail if there is a Parse error found.

@mbabker, @phproberto, @wilsonge If you like this proposal we can add it too to the Joomla-cms repository