Fixes #814273, copy over email backend code to gaia, and insert individual script tags, instead of copying over a built file.
Merge remote-tracking branch 'upstream/master' into bug814273-explode
Minor review cleanup.
Merge remote-tracking branch 'upstream/master' into bug814273-explode

Conflicts:
	README.md
Merge pull request #124 from asutherland/bug814273-explode

Bug 814273 - [email] Replace concatenated gaia-email-opt.js with the files that make it up (as a vendor code drop). r=asuth