Merges branch 'release/0.1.3' into develop
Adds ShellCommand and tests
Adds documentation for the `:Wshell` command.
Marks the shell command todo as done.
Merges branch 'feature/add-shell-command' into develop
Updates changelog for 0.1.4
Bumps version to 0.1.4
Build 0.1.4
Merges branch 'release/0.1.4'