Refactoring of a CreateCalcInterface.java
working version without the static variable storageValue
working version without the static variable storageValue
Revert "working version without the static variable storageValue"

This reverts commit 7a0be4d27c06b7aa544b47bba8bbb79e4d2ae69a.
final commit
Merge branch 'refactoring' of https://github.com/RomaDoma89/Calculator into refactoring

Conflicts:
	.gitignore
	Calculator_v1.0/build.xml
	Calculator_v1.0/build/built-jar.properties
	Calculator_v1.0/build/classes/objects/CreateCalcInterface.class
	Calculator_v1.0/nbproject/build-impl.xml
	Calculator_v1.0/nbproject/genfiles.properties
	Calculator_v1.0/nbproject/project.properties
	Calculator_v1.0/nbproject/project.xml
	Calculator_v1.0/src/calculation/Calculation.java
	Calculator_v1.0/src/calculator/Calculator.java
	Calculator_v1.0/src/calculator/CreateCalcInterface.java
	Calculator_v1.0/src/listeners/ButtonListenerC.java
	Calculator_v1.0/src/listeners/ButtonListenerDate.java
	Calculator_v1.0/src/listeners/ButtonListenerDel.java
	Calculator_v1.0/src/listeners/ButtonListenerEquale.java
	Calculator_v1.0/src/listeners/ButtonListenerNegative.java
	Calculator_v1.0/src/listeners/ButtonListenerPoint.java
	Calculator_v1.0/src/listeners/ButtonListenerSigns.java