Code completion for define, defined and const

Change name to uppercase name.
![nb-php-enhancements-cc-1](https://f.cloud.github.com/assets/738383/2237248/f95ba1e4-9b99-11e3-874c-328c4e8661e3.png)
![nb-php-enhancements-cc-2](https://f.cloud.github.com/assets/738383/2237249/fbd2bbec-9b99-11e3-9ffe-56645fcb1537.png)
![nb-php-enhancements-cc-3](https://f.cloud.github.com/assets/738383/2237251/393e0108-9b9a-11e3-9d03-4e8c2de57aa1.png)