Added madlibs from http://rubyquiz.com/madlibs/Lunch_Hungers.madlib and http://rubyquiz.com/madlibs/Gift_Giving.madlib.
Moved files to mad_libs directory. Added .gitignore for vim temp files.
Can extract simple placeholders and print them.
MadLib: can now set simple placeholder text
MadLibs: started building command-line helper class
Added initial versions of command line support.
Full implementation of command line support.