use only social icons for smaller/faster builds

[todo]

this library only uses envelope, fb, and twitter.

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nypr-publisher-lib/config/environment.js

Lines 4 to 8 in 5214e66

   // @todo use only social icons for smaller/faster builds 
   // @body this library only uses envelope, fb, and twitter. 
   //       see https://github.com/FortAwesome/ember-fontawesome#subsetting-icons 
   return { }; 
 }; 

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This issue was generated by todo based on a @todo comment in 5214e66. It's been assigned to @jjnypr because they committed the code.