added .ahk filetype for autohotkey scripts
added vdf filetype and vpk filetype for Valve source engine archive files
added .gitattributes filetype
added .sig filetype for gpg detached signatures
added types for ms office files
added .3ga filetype for audio recorded mostly on mobile phones
added .ape filetype for monkey's audio (lossless)
added .bsp filetype for map files in Valve Corp. (gold)src and id TecH engines
added .cab filetype for legacy windows packed files
renamed .tar.gz to .gz
Merge pull request #23 from rpdelaney/master

.ahk, .sig, .gitattributes, .vdf, .vpk, others