Use REMOTE_ADDR instead of SERVER_ADDR, add isset() check, wrap vote count in span and make one comment correction

Couple of small updates / fixes:

* When user was voting, PollApe stored user agent string + server's IP address (SERVER_ADDR) -- changing latter to user's IP address (REMOTE_ADDR) seems to much more sense.

* Checking for nonexistent (null) reset setting was throwing notice level PHP error -- fixed by adding a isset() check instead. Other possible value being "true" this should be sufficient solution.

* Wrap comment count inside div.percentage in `<span></span>` to make styling count easier/possible without affecting parent div (for adding padding etc.)

* getBlankValue() comment corrected (PollApe instead of MapMarker.)