Merge pull request #12 from thierryvolpiatto/master

* emamux.el (emamux:mode-function): Simplify.
Bumpup version and update Changes
Merge pull request #13 from thierryvolpiatto/master

* emamux.el (emamux:yank-from-list-buffers): Check if tmux is running.
Remove needless argument

It is enough to use default value.
And re-factoring comparison zero
Bump up version and update Changes