Added contrib notes.
README.md
Update src/php/whatsprot.class.php

Added Location function.
Added RequestLastSeen

Example output:

tx  <iq to="0000000000@s.whatsapp.net" type="get" id="0000000000-1" from="0000000000@s.whatsapp.net">
tx    <query xmlns="jabber:iq:last"></query>
tx  </iq>

rx  <iq from="0000000000@s.whatsapp.net" id="0000000000-1" type="result">
rx    <query xmlns="jabber:iq:last" seconds="403"></query>
rx  </iq>

According to RFC: XEP-0012: Last Activity
Merge pull request #105 from arthursc/master

Added Location & Requestlastseen
Implemented protocol 1.2 (php)
Merge pull request #138 from lowlevel-studios/master

Implemented protocol 1.2, fixes #126 #127 #130 #134 #135 #136
Fixed extremely minor bug in peekInt8

https://github.com/venomous0x/WhatsAPI/issues/141
Merge pull request #144 from zstars/patch-1

Fixed extremely minor bug in peekInt8, fixed #141
fixes crash when more than one node is sent to BinTreeNodeReader::nextTree()
Merge pull request #152 from zjorzzzey/master

fixes crash while polling for messages
Update src/php/decode.php

Remove php close tag.
Update src/php/exception.php

Remove php close tag.
Update src/php/func.php

Remove php close tag.
Update src/php/protocol.class.php

Remove php close tag.
Update src/php/rc4.php

Remove php close tag.
Update src/php/whatsprot.class.php

Remove php close tag.
Fix for sending images
Merge pull request #156 from atans/master

Remove php close tag
Merge pull request #157 from beldar/master

Fix for sending images