Adding split option
Exporting `require` onto window to work with --split option
Segmenting source cleaning routine on a separated method
Implementing split functionality for files outputting js
Fixing sourcemaps in --split mode
Calling reload only when mode isn't release
Letting release mode compress also split files (who knows)
Updating cli usage docs for split option
Checking if notifications should or should not be shown
Properly resolving paths for release in --split mode
Adding dirs handling in the cleanup routine
Testing --split option
Releasing 0.5.2