Handle 'cwd' option in .bowerrc
Use directory where .bowerrc is located as cwd
Resolve paths from options based on process.cwd
Merge branch 'patch-1' of https://github.com/martynovs/main-bower-files into martynovs-patch-1

Conflicts:
	lib/index.js
Merge branch 'martynovs-patch-1'