Finished Settings class

To use the class, just call 'Settings.getLong(<string>)' or getDouble.
You can also supply a second argument to give a default value if anything
 fails.
Then edit the file 'settings.txt' in the root directory of the crio
 and add a line with the string, then a space, either 'l' or 'd' depending
 if it's a long or a double¸ then a space, then the value, then a newline.
The settings file is rehashed every time you try to get a new value or when
 you call the rehash() method.