Updating scraping of coinmarketcap.com

Also:

* relative path in js call to tickerinfo.php because my dev environment is kinda weird :\
* `ppc`->`xpm` in a few spots
* round the CMC price to two decimal points for consistency and to not break site layout
* echoing more info in update_tickerinfo.php
Merge pull request #38 from belovachap/master

Updating scraping of coinmarketcap.com