Add specific pr and branch templates for slack#125

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sahilda wants to merge 2 commits intotravis-ci:masterfrom

sahilda:fix/slack_templates

Commits on Mar 6, 2018

Add specific pr and branch templates for slack
sahilda
committed

Commits on Apr 3, 2019

Rename 'branch_template' to 'branch_build_template'
sahilda
committed