Added drops of Vimux logic wherever necessary.
Fixed a typo.
Makes sure that vimux runs the command in the source directory.
A bit of an undo for the last commit, source-dir doesn't work right.
Tweaked binary_dir() to get abspath of itself.
[util.vim] Updated to expand by default each path when checked.
And fnamemodify() was the farest of them all.
Bumped version up to 0.1.9-1 due to performance tweaks.
Merge branch 'release/0.1.9-1' into develop

* release/0.1.9-1:
  Bumped version up to 0.1.9-1 due to performance tweaks.