setting file extensions of racket modules to rkt
Merge pull request #1 from ilya-klyuchnikov/racket

setting file extensions of racket modules to rkt
Removed redundant file
Updated .gitignore
Fixed incorrect behavior on requesting input strings.
Modified .gitignore
Fixed target program extension (to .rkt). Added '#lang' directive.
Fixed self-aplication.
Fixed generated generator application
Ported recursive version (Robert Glueck's version)
Changed version. Added changes description.
Removed TODOs. Changed readme