Added text framework for tokenizing line by line.
Merge branch 'master' of https://github.com/nfischer/CS111Lab1

Conflicts:
	read-command.c
Fixing a typo that caused a good deal of errors.
Merge branch 'master' of https://github.com/nfischer/CS111Lab1
Changed build_command_stream() to be build_command(), so that the stream will be built line by line