Add Horde/Alliance header lines

[WyriHaximus]

1. Go to https://github.com/WyriMaps/php-x-headers/tree/master/src
2. Select Horde.php or Alliance.php
3. Add a new header in the format 'X-TOPIC' => 'CONTENTS', where TOPIC is the topic (Thrall, Orgrimmar etc etc) and where CONTENTS is a quote/fact/etc about TOPIC.
4. Save changes and create pull request

OR

1. Go to https://github.com/WyriMaps/php-x-headers/tree/master/src
2. Create new Faction.php file (where Faction is the faction you want to create headers for)
3. Fill file with https://gist.github.com/WyriHaximus/4b81d27b73f6f4b1a953d3c923ca3e3d
4. Add a new header in the format 'X-TOPIC' => 'CONTENTS', where TOPIC is the topic (Worgen, Gilneas etc etc) and where CONTENTS is a quote/fact/etc about TOPIC.
5. Save changes and create pull request

These headers will be used in the upcoming rebuild of WyriMaps.net and WoW-Screenshots.net. Also I'll keep this issue open so others can pick up on it and create their own PR's

[bennychan]

I'll add some