Fixed a an issue in less.js-middleware that made it with less 1.4.0, which was released yesterday. Also bumped less dependency to ">= 1.4.0" and less.js-middleware package version number to 0.1.12
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Issue: 'import_rule.path' was a string in previous versions of less, but in 1.4.0 it is now an object.

Resolution: Changed lib/determine-imports.js usage of 'import_rule.path' to 'import_rule.path.value', which is the now correct string value.