Add links to charts

Lean chart
Working hours tracking
Merge pull request #54 from hwikgren/patch-1

Add links to charts
Merge pull request #56 from akesulah/development

Created User model to enable voting and comment
Merge pull request #57 from akesulah/development

Fix keywords bug in users_controller
Create RSPEC tests to models/contollers

Enhanced test coverage
resolves #70