Snappy rename

Renames sncompress to snappy_compress and snuncompress to snappy_uncompress to maintain code compatibility with PHP (when using php-snappy):

https://code.google.com/p/php-snappy/

Fixes compatibility specifically with:
is/blob/master/Cm/Cache/Backend/Redis.php#L857

My commit message should say sncompress to snappy_compress!