Add "make doc" to makefile
Move TypeTest to lang folder in tests
Write a sh#$ implementation of a Type::signature function
This allows to easer create signatures for functions
Write tests for Type::signature()
Dropping support for php 5.3 and 5.4
Temporary solution to "Only variables should be passed by reference"
Replace some hardcoded class names with {ClassAlias}::class
Fix Type::signature()
Add tests for Point class
add some ImageTests