* [feat] add method split to range ips, to convert range smaller range

* [refactor] change split method to array

* [style]

* [refactor] delete interface split

* [test] add test

* [style]

* [test] php 5.3, 5.4, 5.5 compatibility

* Describe the type of the result of the split method

* Be sure that we receive an int as the argument of the split method

* Always run all tests

* Fix and simplify tests

* Use Coveralls only for the mlocati's repo

* Simplify "if" statements

* Document that split() can throw a \RuntimeException

* Optimization + accept a network prefix that's the same as the range's one

* Use OutOfBoundsException if $networkPrefix is invalid

* Check maximum range sizes for 32-bit systems

* Fix running Coveralls

* [feat] handle pattern range and update DocBlock

* [fix] move split method to single class

* [fix] fix class pattern

* [chore] update return type

* [test] add single test and pattern test

* [style] add readme

* [style]

* Add getNetworkPrefix() to RangeInterface

This implies checking $networkPrefix for Single::split() too, without efforts

* Add $forceSubnet parameter, test overflow for 64-bit systems too

* Fix coding style

* Improve documentation about the split() method

* Add @SInCE to split()

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Co-authored-by: Michele Locati <michele@locati.it>