Remove dev from zend packages

Hopefully this fixes the problem with Travis CI
Update README.md

Add build status image
Merge branch 'working'

Conflicts:
	composer.json
Remove phpunit

Let's assume it is installed on every development system via pear
and so it saves time in Travis CI.
Extended README a bit
Update README.md
Change to dev-master
New Trait "SmartIterator"

Aims to provide convenience methods for iterators
Implement select(), clear() and map()
Implement guard: check value before adding it
Remove require-dev

Seems to cause problems with scrutinizer-ci
Examples of the new SmartIterator features
Remove Autoloader