Remove 0th element previosly added since it's already covered by 2nd element and reversed merge order.

I think it looks good now:

include_path before merge:
```
/Cake/TestSuite/CakeTestSuiteDispatcher.php (line 136)
########## DEBUG ##########
'/home/rachman/work/personal/deploy/lib:/home/rachman/work/personal/deploy/croogo-app/Vendor/cakephp/cakephp/lib:.:/usr/share/php:/usr/share/pear'
###########################
```

contents of `$vendors`:
```
/Cake/TestSuite/CakeTestSuiteDispatcher.php (line 157)
########## DEBUG ##########
array(
	(int) 0 => '/home/rachman/work/personal/deploy/croogo-app/Vendor/',
	(int) 1 => '/home/rachman/work/personal/deploy/croogo-app/Vendor/cakephp/cakephp/vendors/',
	(int) 2 => '/home/rachman/.composer/vendor/'
)
###########################
```


include_path **after** merge:
```
/Cake/TestSuite/CakeTestSuiteDispatcher.php (line 158)
########## DEBUG ##########
'/home/rachman/.composer/vendor/phpunit/phpunit:/home/rachman/work/personal/deploy/lib:/home/rachman/work/personal/deploy/croogo-app/Vendor/cakephp/cakephp/lib:.:/usr/share/php:/usr/share/pear'
###########################
```