attempting lighter builds without tests

Preparing tests for higher PHPUnit versions

Fix #9 is_callable(mapper) === false must throw

Fix #7 Compatibilidad con funciones unary

Fix #5 funciones independientes a otro paquete

Renamed package to Apantle\HashMapper

Merge branch 'fix-pre-1.0-launch'

Merge branch 'prepare-publish-1.0'

Fix #9 Updated README with documentation of more use cases

Updated badges to include Travis build status