Merge pull request #2 from jonnywilliamson/master

Ability to send Audio/Video/Image messages via URL or local file.
Fixed reconnection

See issue 321:
https://github.com/venomous0x/WhatsAPI/issues/321
Moved construction of reader and writer from __construct() to Connect()
to allow reconnection using the same WhatsProt object.
Cleaner reconnection fix

Moved the constructors for reader and writer back to __construct() and
added resetKey() method on new login request.
Disabled Login()

Too many questions about the same issue.
Fixed identity in requestCode()
Fix for reset key

`unset($this->_key);` will display `Notice: Undefined property`
Merge pull request #3 from atans/master

Fix for reset key
Removed my exception in checkCredentials

According to manufuentescr checkCredentials() still works, so no reason to disable it
Update WhatsProt::createGroupChat()

Param $participants is an option now
Merge pull request #4 from atans/patch-1

Update WhatsProt::createGroupChat()
Variable's first letter should be lowercase.
Merge pull request #5 from atans/patch-2

Variable's first letter should be lowercase.
Updated contacts.php

Automatically add leading "+" sign if necessary, this also means that
all phone numbers must now include country code. This is due to many
questions about it and having the documentation hidden in the php file
instead of the wiki.
Added debug to contact sync
Disabled verbose mode in contacts.php

Thanks to @manufuentescr
Updated contacts.php
Added support for custom identity

Allows you to enter a custom identity on Login()
This identity can be extracted from your phone using either MissVenom or
WhatSNiff
Added debug info to checkCredentials

Added debug info since there were many questions about it.
Added thumbnails using GD

Added thumbnails for sending image messages using the GD extension.
Previously this only worked using the ImageMagic extension which is
quite uncommon.
requestCode debug and error handling

Added debug info and improved error handling in WhatsProt::requestCode()