Renamed test files to better see what will be tested
Tests: renamed include files to better ignore temporary test files with .gitignore
Implemented function stem_algos() which returns a list of supported stemming algorithms.
Removed function stem_enabled() as this should be done using stem_algos() instead.
Now the function stem() requires both arguments and the algorithm is a lower cased string of the algorithm.
Now the STEM_* constants contains the algorithm name but the STEM_DEFAULT has been removed.
Make the original porter algorithm optional
PHP_MINIT & PHP_MSHUTDOWN isn't required for this extension
Better phpinfo output