Update Notice file based on the Best Practices (being finalized)

Specifically, please address:

(1) Alphabetize the list in notice file based on the dependency name or follow the same order as Godeps.json so that its easier to follow through
(2) Add a list of references from where you composed following list of dependencies, for example, Godeps.json or build.gradle etc.
(3) Add a link to the license file for example, https://github.com/magiconair/properties/blob/master/LICENSE
(4) Add a separation between two dependencies something like ------so that its easier to read and follow through
(5) go-md2man (https://github.com/cpuguy83/go-md2man) is not listed in GoDeps, please check if we still have dependency on this.