removing third parameter in round() method calls as it's not supported by php <5.3

Hi,

First of all I love the theme!

But unfortunately my cheap shared hosting only runs PHP 5.2.17, and was throwing errors on the round calls you make when you're calculating how long posts will take to read.

I've gone through and removed the third parameter form all the round() calls and tested it on my server which is running PHP 5.2.17 and everything looks sweet.

I figured I'm probably not the only person who might have an slightly older version of PHP, so thought I'd push the changes and create my first ever pull request.

Cheers.


Jolyon