Implemented functionality to handle node click

...ain/java/fucoin/configurations/AbstractConfiguration.java

src/main/java/fucoin/configurations/GephiConfiguration.java

...main/java/fucoin/configurations/internal/GephiLoader.java

...java/fucoin/configurations/internal/NodeClickHandler.java

src/main/java/fucoin/gui/gephi/GraphWindow.java

src/main/java/fucoin/gui/gephi/MouseListenerTemplate.java

src/main/java/fucoin/gui/gephi/NodeMouseListener.java