v1.4.1

This new version packs bunch of goodies and fixes. A brief list is as follows:

1. Invoker supports processes that are inactive by default but can be started
   via invoker add. More information - #114
2. Invoker now supports a global config file defined in ~/.invoker directory which can be
   used from anywhere.
3. Added support for Debian, Mint and Arch Linux.
4. When starting invoker one can specify the beginning port. More details:
   #147
5. Added bash completion for Invoker - #148
6. when running invoker list, also show port number - #149
7. Invoker now supports different subdomains to be directed to different applications.
   For example: foo.dev can direct to web application whereas chat.foo.dev can direct to
   another application. More details - #129