Updated man page and tweaked brainfuck_shell.c

Reflects changes made to the modes that are now available. Removed
capital letters in printed messages, this seems to be how a majority of
CLI utilities display their messages.
Updated README and LICENSE

Usage reflects available options, added more tested platforms
Merge pull request #10 from aliclubb/develop

Updates to README, LICENSE, MAN page and brainfuck_shell.c
Updated REAMDE.markdown
Updated README.markdown