Fix some spelling mistakes.

Walkthough -> Walkthrough
predicte   -> predicate
timouts    -> timeouts
occured    -> occurred

Rasperry   -> Raspberry

recomended -> recommended

mileau     -> milieu
libary     -> library

langugage  -> language

libaries   -> libraries
licence    -> license
fianance   -> finance

licencing  -> licensing
Merge pull request #30 from tankrim/spelling

Fix some minor spelling errors.