Add to default ignored extensions.

Added to default ignored extensions:
.gif, *.txt, *.rtf, *.m3u, *.rar, *.sfv, *.md5, *.ico, *.doc, *.zip
Update changelog.txt
v0.0.1.19

-change scanCounter to time.clock()
-if completed before initialTimeOut, goto results
-hopefully catch a weird rare crash at line 104
Update changelog.txt
Merge pull request #48 from srazer/master

V0.0.1.19