Don't fail namespaces with names same as functions

Fixes warnings for deprecated functions in the following examples (not limited to):

use \DL\App;
use DL\App;

Warning thrown:
"The use of function dl is discouraged in PHP version 5.3 and discouraged in PHP version 5.4 and discouraged in PHP version 5.5"
Merge pull request #21 from Shimonenator/patch-1

Don't fail namespaces with names matching deprecated functions