Add 'Running' section to Bash styleguide

@polynomial please review change.
Perhaps better asked, should we enforce the naming convention in examples?
Only source if BASH_SOURCE and the filename matches convention?
On Dec 8, 2014 2:28 PM, "Susan Potter" <notifications@github.com> wrote:

> In bash/README.md:
>
> > @@ -284,6 +284,21 @@ Appropriate uses for a Bash script are:
> >  * If you are using `read` you probably did something wrong. The user should
> >    be able to supply all input on the command line.
> >
> > +### Running
> > +* All scripts that could be sourced or be executed should separate sourcing
> > +  and execution paths. See below
>
> This should only apply for executables then that can also be sourced.
> Unless I am missing a sourced Bash file that could be executed scenario?
> Are you asking me to make that clearer in the text above? I wasn't sure.
>
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> <https://github.com/mbbx6spp/styleguides/pull/17/files#r21491861>.
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