Fix #9 - Replace expr with grep for matching
Merge branch 'replace-expr-with-grep' of https://github.com/lollek/hashbang.sh into lollek-replace-expr-with-grep
Merge branch 'lollek-replace-expr-with-grep'
Provide POSIX compliant ask function (no read -p).
Politely ask bash to be POSIX compliant.
Add a few comments.
Add a clear before the configuration phase.
Fix substitution of unset/null string of a potentially unset variable.
Improved POSIX compliance.

Should now be completely POSIX compliant (needs critique and comments).

Signed-off-by: necrophcodr <tcg.thegamer@gmail.com>
Fix usage of echo flags (not POSIX).
Fix erronous use of printf.
Fix ask function printf typo.
Merge pull request #14 from necrophcodr/develop

Improve/Perfect POSIX compliance