Add new basic helpers to Ember#388

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cibernox wants to merge 9 commits intoemberjs:masterfrom

cibernox:new-basic-handlebars-helpers

Commits on Oct 13, 2018

Commits on Oct 14, 2018

Reextructure motivation and mention the importance of lazy argument evaluation
cibernox
committed

Commits on Oct 15, 2018

Commits on Nov 5, 2018

Add `{{not-eq}}` to the list of helpers
cibernox
committed

Commits on Nov 6, 2018

Update detailed implementation with arity and other details of each helper
cibernox
committed

Commits on Jan 25, 2019