Prompt library with chomp feature

We can now give prompt a named parameter called chomp when we want to
chomp the users response.
Now have required convert method

We are also using the prompt method from our 'library' file.

Not sure this is completed.
Modularized methods for cleaner business code

Extracting the heard condition makes sense for conceptualizing what is
happening, rather than only seeing what technically our code is doing.

Our method gramma_speaks now only deals with the response for Gramma,
rather than the 'business' of routing the conversation.

The running code (client code) decides the rules of engagement... yet
Gramma knows if she can hear something or not.  It is her
responsibility.

This still has the bug of gramma responding as though silence is heard.
Merge branch 'DeafGranny'
Merge branch 'master' of github.com:gabrie30/RubyLearning

Conflicts:
	3_week/6e_deaf_granny_part_1.rb