added rbenv file to gitignore
updated README.md
Fix votes percentage bar width
Add spec to cover render_percentage_bar when it receives negative values.
Changing text from 'percentage' to 'votes_count' to represent the domain rule.
Limiting bar width to 200px that means 100 votes, but shows the real votes count number even when over 100 votes.
Rename helper method that was missing and breaking tests.