Undusting 'pxt extract' (#3604) (#3605)
Undusting 'pxt extract' (#3604) (#3605)

* refresh generated tasks

* undusting extract

* adding travis file
switch-education/pxt,Microsoft/pxt,switch-education/pxt,switch-education/pxt,Microsoft/pxt,switchinnovations/pxt,Microsoft/pxt,playi/pxt,playi/pxt,Microsoft/pxt,switch-education/pxt,switch-education/pxt,switchinnovations/pxt,Microsoft/pxt,playi/pxt,playi/pxt,switchinnovations/pxt,switchinnovations/pxt