Upgraded ember-addon to 2.12.3#15

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SanthoshRaju91 wants to merge 3 commits intoMaazAli:masterfrom

SanthoshRaju91:master

Commits on Jan 12, 2018

Upgraded the addon with passing test cases only for eslint.
SanthoshRaju91
committed
Added todo list for the addon
SanthoshRaju91
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Changed the index.js by adding _findHost hook, this addon can support ember-engine
SanthoshRaju91
committed