get bower paths from .bowerrc [$15]

[austinpray]

Currently the bower path must be manually added as an option:

asset-builder/test/test.js

Line 305 in 8f9570e

var output = m('test/fixtures/roots.json', {

https://github.com/ck86/main-bower-files/blob/85b7102850645f9e6f42a27c81680f574da22476/lib/index.js#L32

roots/sage#1362 (comment)

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