Prettier output with unicode colored characters when in interactive m…

…ode.

Closes bash-unit#25

Document -f tap format.

Merge pull request bash-unit#27 from rcastagnet/master

FIX issue bash-unit#26

Merge pull request bash-unit#21 from n0vember-/master

Addendum to README concerning archlinux package

FIX bash-unit#18: bash_unit changes current working directory to curr…

…ent test file

FIX link in documentation toc

assert_print_stdout_stderr

Update corresponding documentation.