Add callback support for walk.
Fixes issue #55. Passed stdin to child processes when walking.
Some more tweaks to stdio
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Merge branch 'master' of git://github.com/ryanvanoss/shifter into ryanvanoss-master
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Added --build-dir to --walk
Fixed arg order
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Moved replacers to after wrap to make sure it gets the full file to replace on
Removed console.logs
Fixed buildDir for rollup modules
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Fixed issue with build-dir and --walk not working properly
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