Add eval-in-repl

Consistent eval interface for various REPLs

This package does what ESS does for R for various REPLs, including ielm.

Emacs Speaks Statistics (ESS) package has a nice function called ess-eval-region-or-line-and-step, which is assigned to C-RET. This function sends a line or a selected region to the corresponding shell (R, Julia, Stata, etc) visibly. It also start up a shell if there is none.

This package implements similar work flow for various read-eval-print-loops (REPLs) shown below.

https://github.com/kaz-yos/eval-in-repl/
Merge pull request #1819 from kaz-yos/eval-in-repl

Add eval-in-repl (Consistent eval interface for various REPLs)