Initalised server development

Please look through the code and give suggestions; I'm not entirely confident in making PHP applications that are bigger than simple scripts.

The idea is to have an `index.php` file that instantiates the app as opposed to having a huge single-file application, so `includes/walkingTalkCreator.php` has the bulk of the code.

I'm looking for a templating engine that doesn't suck; I was thinking maybe one of the forks of the PHP implementations of [Jade](http://jade-lang.com/), but I'm unsure as to which fork is the best fork. At the moment there is a simple static HTML file that gets included in a very roundabout fashion.

We also might want to find a BDD testing framework.

**Note**: This commit is artificially large due to the [Semantic UI](http://semantic-ui.com/) binary files and SVGs; the .php files are the important bits.

Meta
----
+ Add note to README noting repo changes
+ Add note to README with link to style guide

Resources
---------
+ Add Semantic UI
* The .zip file has been committed for convenience
+ Add home.html as a placeholder

PHP
---
+ Add index.php as an entry point
+ Add defaultSettings.php as a placeholder for configurations
+ Add bootstrap.php to initialise everything
+ Add walkingTourCreator.php as a central class