moved auxilary comments to the end of the document
added problem description
Merge pull request #2 from shortOS3/Alex

updated 1.2, 3, 4, 5 and 8
merged with interim
ended first chapter
fixed spelling
rephrasing the crawling section
Merge pull request #3 from shortOS3/Nick

Nick
Merge pull request #5 from shortOS3/Nick

Nick
corrections