Add rebar 3.7.x compatibility#3

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nalundgaard wants to merge 3 commits intobasho:masterfrom

alertlogic:rebar_3.7_compat

Commits on Nov 26, 2018

compatiblity with new resource format

daniel-zinov
authored and
nalundgaard
committed
make absorb_resources compatible with all resource formats
nalundgaard
committed

Commits on Dec 19, 2018

Implement resource v2 callback compatibiity
nalundgaard
committed