Update edwin.md

Slight update to prevent linkrot and adjust a bit of the text.
Merge pull request #9 from esdalmaijer/patch-1

Update edwin.md
Update Android page
Fix spacing in form figures
Add APS date
Update 04-custom-forms.md
Merge pull request #10 from lvanderlinden/patch-7

Update 04-custom-forms.md
Add pac-man notification
Fix bit-size typo
Add back-end poll
Add Datamerger info
Improve form performance issues info
Add droid page.
Add plug-in development documentation.
Update back-ends page
Fix typo
Remove poll and torrent link and add Mac OSX 0.27.1 package
Fix typos in Boks page
Remove poll
Add sound recorder page