Fixed Singleton trait strict standards error

Singleton getInstance() method was being called statically when it
wasn't declared static.
Fixed Cache strict standards notice.

Cache function setContent() wasn't using a reference for array_walk, it
was using glob directly. Moved glob into a variable to fix this notice.
Input class now has a delete function
Removed print from API Controller

Also deleted 'redirect' variable from input if present in API call.
Minor version bump + Changes log #26

PHAR has been recompiled and a changelog added.
Merge pull request #35 from BlackBoxFramework/dev

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