Video Preview

should install ffmpeg for the method to work successfully
fixes broken link in readme
Merge pull request #597 from bartj3/fix/readme

fixes broken link in readme
Merge pull request #592 from manufuentescr/patch-4

Video Preview
Added check for ImageMagic and FFMPEG installation

Still uses generic pre-rendered thumbnail as fallback if one of the dependencies is missing
Also inb4 syntax or code errors. I uses the browser editor for this commit :')
Thumbnails for videos fixed
Sync ported from .NET
Merged in grzegorz_godlewski/whatsapi (pull request #1)

Videos and sync
Keystream encryption fixed
On receipt event added
Merged in grzegorz_godlewski/whatsapi (pull request #3)

Keystream fix
Fixed incomplete str_replace
Automatically add leading + sign if necessary
Added photo support for vCard
Fixed sending media and vcards
Fixed vCard photo encoding
Removed unused experimental code
Added photo support for vCard
Merge branch 'master' of https://bitbucket.org/shirioko/whatsapi
Fixed null pointer exception for IQ node