I want to use linq.js for my assertions. Is there a way to include an external library in Postman?
No, linq.js, or any library not available in the Postman Sandbox cannot be used in Postman (by default, there is a workaround).
linq.js
Actually, if you fetch a script in a request and eval it, you can use it in Postman. An example is given in this blog post - http://blog.getpostman.com/2015/09/29/writing-a-behaviour-driven-api-testing-environment-within-postman/
eval
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