0.35: fix detection + fix dependency check + everything since 0.11

• adapt detection to changes from Google, fixes #2 (0.35)
• check for lxml module which is needed for the scraping method by BeautifulSoup4 (0.35)
• implemented threading for faster results (default: 10 threads) (0.3)
• implemented basic modularization (0.3)
• changed scraping method (only checking release date was unreliable) (0.2)