Added ffmpeg, haxelib, Matt's Traceroute and imagemagick convert.

pages/common/convert.md

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+# convert
+
+> Imagemagick image conversion tool
+
+- Convert an image from JPG to PNG
+
+`convert {{image.jpg}} {{image.png}}`
+
+- Scale an image 50% it's original size 
+
+`convert {{image.png}} -resize 50% {{image2.png}}`
+
+- Horizontally append images    
+
+`convert {{image1.png}} {{image2.png}} {{image3.png}} +append {{image123.png}}`

pages/common/ffmpeg.md

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+# ffmpeg
+
+> Video conversion tool
+
+- Extract the sound from a video and save it as MP3
+
+`ffmpeg -i {{video-filename}} -vn -ar 44100 -ac 2 -ab 192 -f mp3 {{sound.mp3}}`
+
+- Convert frames from a video into individual numbered images 
+
+`ffmpeg -i {{video-filename}} {{image%d.png}}`
+
+- Combine numbered images (image1.jpg, image2.jpg, etc) into a video
+
+`ffmpeg -f image2 -i {{image%d.jpg}} {{video.mpg}}`
+
+- Convert AVI video to MP4. AAC Audio @ 128kbit, Video @ 1250Kbit
+
+`ffmpeg -i {{in.avi}} -acodec libfaac -ab 128k -vcodec mpeg4 -b 1250K {{out.mp4}}`

pages/common/haxelib.md

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+# haxelib
+
+> Haxe Library Manager
+
+- Search for a Haxe library
+
+`haxelib search {{keyword}}`
+
+- Install a Haxe library
+
+`haxelib install {{libname}}`
+
+- Upgrade all installed Haxe libraries  
+
+`haxelib upgrade`
+
+- Install the development version of a library from a Git repository
+
+`haxelib git {{libname}} {{GIT-URL}}`

pages/common/mtr.md

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+# mtr
+
+> Combined traceroute and ping tool
+
+- Traceroute to a host and continuously ping all intermediary hops
+
+`mtr {{host}}`
+
+- Disable IP address and host name mapping
+
+`mtr -n {{host}}`
+
+- Generate output after pinging each hop 10 times  
+
+`mtr -w {{host}}`
+
+- Force IP IPv4 or IPV6
+
+`mtr -4 {{host}}`