CLI piping

- Add "pipe-ability" - to chain from one action, to the next, ie.
task list due:next.month proj:work | proj:holiday +time-off
to change next months work projects to the category "holiday" and add the tag "+time-off"
most useful when applying a change to the results of a filtered listing. bash reserved characters will make this interesting.
pb: <head explodes> djp:rotflmao!!! but POWERFUL! Imagine being able to toss into the CLI;
task list +staff due:jun | export.pdf.timesheet BANG !

note: this is now obsoleted by new command structure and the "update" command.

so the above example will be possible with

task due:jun +staff export export.pdf.timesheet

(i think)

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