[N/A] Change sign in and sign up wordings. Added sing up in application header when not signed in.

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[N/A] Add team model and some spec tests

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[N/A] Modified db schema, add rake db tasks note

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[N/A] Update rake_db_tasks markdown file

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[N/A] Update rake_db_tasks markdown file

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[N/A] Create Team model and associate many to many relationship with users and drops through team

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[N/A] Update Gemfile.lock and added rake task to stop db server and add it as dependency to server start

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[N/A] Fix some tests, data models, controllers

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[N/A] Fix remaining failing tests.

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Merge branch 'feature/project-overhaul' into develop