Refine exif.markdown.
Refine exif.markdown and imageinfo.markdown.
Add more content.
Add watermark.markdown.
Add mixed ops.
Refine imagemogr.markdown.
Refine avthumb.markdown.
Reformat sample list.
Refine segtime.markdown.
Refine segtime.markdown.
Refine segtime.markdown.
Refine video-watermark.markdown.
Refine md2html.markdown.
Refine vframe.markdown.
Refine saveas.markdown.
Refine qrcode.markdown.
Refine pfop.markdown.
Refine pfop.markdown.
Add prefop.markdown.
Merge pull request #19 from BluntBlade/feature/newdocs

Feature/newdocs