Command predicates

[jgrey4296]

As mentioned in issue 384, this

• removes the eask repl command from eask-special-p so it loads the Eask file and correctly sets the load-path.
• adds eask test buttercup to eask-execution-p so the eask--error and eask--warn advice are not applied, which can crash buttercup tests checking for error signals.

[jcs090218]

The "test/buttercup" looks good.

The command eask repl is designed to be used with/without the Eask file. Is your Eask file not being loaded correctly? 🤔

Under project:

> eask repl
A message from the project local Eask file!!
*** Welcome to IELM ***  Type (describe-mode) or press C-h m for help.
ELISP> (kill-emacs)

With global Eask file:

> eask repl
A message from the home dir Eask file!!
*** Welcome to IELM ***  Type (describe-mode) or press C-h m for help.
ELISP> (kill-emacs)

Without global Eask file:

> eask repl
*** Welcome to IELM ***  Type (describe-mode) or press C-h m for help.
ELISP> (kill-emacs)

[jcs090218]

I have applied the proper fix in #386.