Handlebars PHP 5.4 - with new helpers, array slice and more

Hello world, I made some updates that I think the rest of the community could benefit from.

1. Requires PHP 5.4. > PHP 5.2 is out of the game and 5.3 is quickly following in the grave

2. Added {{else}} in {{#each}} . Else in each allow us to do something else if the Array is empty, instead of using {{#if}}

	{{#each Array}}
	   something
	{{else}}
	   Nothing found
	{{/each}}


3. Added slice in each Array, to slice the data to display

	{{#each Array[start:end]}}

Get the 10 items

	{{#each array[0:10]}}
		{{.}}
	{{/each}}

Get the last two

	{{#each array[-2:]}}
		{{.}}
	{{/each}}
	
more:

 * {{#each Array[start:end]}} = starts at start trhough end -1
 * {{#each Array[start:]}} = Starts at start though the rest of the array
 * {{#each Array[:end]}} = Starts at the beginning through end -1
 * {{#each Array[:]}} = A copy of the whole array
 * {{#each Array[-1]}}
 * {{#each Array[-2:]}} = Last two items
 * {{#each Array[:-2]}} = Everything except last two items
 
 
4. Fix a bug in {{@key}} where if an array has one key/value element, it will not display @key

5. After create $handlebars, your can render by using it as function: 

	echo $handlebars("Hello {{you}}", ["you" => "me"]);
	
6. A better documentation

7. Change arrays from array to [] (php 5.4)

8. Cleanup