Changes 3/27/14

Ruby:

• I just realized that variables defined in if statements aren't out of scope from the rest of the code block.  I don't know why I thought they were.
• Learned about begin, rescue, and ensure for error handling
• I'm still not sure why you do "Exception => e" after rescue in order to get the exception object, I will look into this tomorrow
• Learned about undef to remove a function
• Learned about differences between Integer("123abc") and "123abc".to_i.
• The first throws an exception, and the second returns 123
• Learned that calling 'method()' is equivalent to calling 'method' unless method=somevalue is state.
• For example:

  def method() 
    "Abcdefg" 
  end 
  puts method # outputs Abcdefg 
  puts method() # outputs Abcdefg 
   
  method = "Other string" 
  puts method # outputs Other string
  puts method() # outputs Abcdefg