Added script cmd in cmd.go
Add switchContext function to context.go
Added panicked attribute to context.go

This attribute is set to false during initalisation, and it's set to
true when error arises.
Go-shellwords added to Gomfile

This packages allows us to parse shell commands. Useful for
script_run.go (later added)
Refactored main.go

The main function - whuch runs aptly commands - has been taken out from
main.go and included to the cmd package. This is useful for the aptly
script run command, which should use that behaviour.
aptly script run implementation

This new aptly command will allow to run multiple commands within a single
aptly command, running in a single thread. The commands can be included
in a text file or added to the aptly script run command in one line,
separated by comas ','.
If one command returns an error, then all the subsequent commands will
be skipped.
Each command output will appear on the console within coloured strings,
clearly stating which command is running and the start and the end of
the received output.
Aptly script has now become aptly task

It makes more sense. Multiple lines of aptly commands can now be called
'aptly tasks' which could potentially be automated, in the future?
Better wording for task run message.
Fixed t03_help:MainTest failing due to new cmd
Making sure context is initialised before using it

Now checkong context is not nil before setting panicked = true