create concat task
Merge pull request #18 from devster/concat-task

create concat task
#14: Allow $isPrinted to be set and used to suppress some output.
Merge pull request #20 from pfaocle/master

#14: Allow $isPrinted to be set and used to suppress some output.
sixes to some tasks
changed
tests added
added travis yml
added cool badges
added logs to git
changelog updated
test helpers fixed
fixed passing exit code
fixes tests
fixes tests
updated changelog
Merge remote-tracking branch 'upstream/master'