WIP code optimizing

this is a resend PR of #67

current state:
- [optimize logic structure and nested if](https://github.com/eyecatchup/SEOstats/blob/master/SEOstats/Services/Google.php#L128-L182)
- [optimize nested if](https://github.com/eyecatchup/SEOstats/blob/master/SEOstats/Services/3rdparty/GTB_PageRank.php#L72-L102)
- [optimize autoloader class](https://github.com/eyecatchup/SEOstats/blob/master/SEOstats/Common/AutoLoader.php#L44-L61)

planned:
- can [this](https://github.com/eyecatchup/SEOstats/blob/master/SEOstats/Services/Google.php#L179-L181) moved up on top of the loop (after the [exit if](https://github.com/eyecatchup/SEOstats/blob/master/SEOstats/Services/Google.php#L134-L137))? It will be no logic different for me. pls give me some feedback