Tweak README
Tweak README: add brand new section on "How to Report Issues"
(Close PR #57, squashed by @jf)

added gemset init command

directory name sanity check & refactor

explanatory message about new gemset

reduce number of calls to rbenv

explanatory message fix

utilize rbenv-gemset-file
Update README: latest version is now 0.5.4
(Close PR #61, squashed by @jf)

Fixed duplicated "global" gemset when using `rbenv gemset active` with bash-3.2

Alternative fix for duplicate "global" gemset from `rbenv gemset active` with bash-3.2

Fixed duplicated "global" gemset in `rbenv gemset active` for bash-3.2

Adhere to style guidelines
Add "init" to list of commands in help output