Improvements and new additions

Changes: 

* Update `devDependencies` (this is required because of [this](https://cloud.githubusercontent.com/assets/1223565/4373269/63aced12-432b-11e4-9de2-14d8e7f331e6.png)) and build 
* Add info on why WOFF 1.0 font files shouldn't be compressed 	
* Add data for WOFF 2.0 font files (`.woff2`)
* Add data for WebVTT files (`.vtt`) 
* Add data for JSON-LD files (`.jsonld`) 

Please see the commit messages for more details.

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@dougwilson, @jonathanong Let me know if I need to change anything!
@jonathanong yes, see: https://github.com/alrra/mime-db/commit/1e33262c7e3680a3454cbb7d3fd0bb046ce10bb5.