Revert "Merge branch 'C3_marwa-mehanna_#218_competition_crud' into C2_abuali_#240_competitions"

This reverts commit 0ed0de26a2bd53343db265a52e3bc75766d3e83c, reversing
changes made to 209516296c863c94e12fafae8ba7dce4def1faba.
Merge branch 'C3_marwa-mehanna_#218_competition_crud' into C2_abuali_#240_competitions

Conflicts:
	Idearator/app/assets/stylesheets/competitions.css.scss
	Idearator/app/views/competitions/_index.html.erb
	Idearator/app/views/competitions/index.js.erb
	Idearator/app/views/layouts/_navigation.html.erb
	Idearator/lib/tasks/populate.rake
Issue #240 , add scenario for investor
Issue #240 , added message for no competitions