Add support for sendgrid template engine.#23

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tant42 wants to merge 4 commits intostephenb:masterfrom

Commits on Feb 10, 2015

Add support for sendgrid template engine. Remove redundant json dependency from gemspec.
Tan Tran
committed

Commits on Apr 8, 2016

Update to use sg instead of gs variable names.
Tan Tran
committed
Merge remote-tracking branch 'upstream/master'
Tan Tran
committed
Test to demonstrate usage of sendgrid templates.
Tan Tran
committed