Create data structure

*Hash of three arrays, one for each line
Change structure of data structure

*define each line as separate variable instead of arrays within the hash
*lots of notes and comments. Fell asleep last night. This doesn't work, yet
Add conditionals and math
Add and test first input. The rest should just be duplication
Finish getting input from user

*change data structure BACK (was not using variables created to hold arrays of each line, cleaner this way)
Add option to display list of acceptable station names. Still working on display
Add option to display list of acceptable stops

*'y' displays the list, any other key is treated as no.