First changes towards new version

Topic 1. Change endpoint to Spotify search 
Topic 3. Removed AMD, added browserify, NPM, and NodeJS
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Removed templates topic. Added AngularJS topic.
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Change based on feedback
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Changes to make tag names visible
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Removed hardcoded number of days in headers
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Fixed TOC links
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Add more on DevTools
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Add an exercise on Handlebars
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Change weird link :P
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Changes in descriptions
Merge pull request #7 from eabait/master

Topics upgrade