Improved functionality with videos

#176

• FB video validation is now more relaxed

#177

• A twitter video class is added to twitter videos for better CSS modifications. The class is twitter-video

#178

• AMP pixel accepts http for transforming into https.

#182

• Youtube video hashes are now converted to start positions with data-param-start

#179

• Tall Pinterest pins are now supported

#165

• amp-accordion is now properly mapped in the components

Thanks to @obeyer and @renzit for improving the library :)