Updated scripts, switched file input flag to -o

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# Changes to be committed:
#	modified:   README
#	modified:   examples/README
#	renamed:    examples/dicts/20k.txt -> examples/dict.txt
#	deleted:    examples/dicts/1k.txt
#	deleted:    examples/dicts/2k.txt
#	new file:   examples/doubles.sh
#	modified:   examples/learn.sh
#	modified:   examples/lesson.sh
#	modified:   examples/practice.sh
#	modified:   examples/words-by-letter.sh
#	modified:   main.c
#	modified:   opt.c
#	modified:   typer.c
#	modified:   typie.1
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