Added sendNickname function

A nickname has to be sent at the beginning of the session. When not set the Iphone client will display the phonenumber instead of the name. The nickname can be changed during the session.
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