Merge pull request #2 from natxet/master

Changes in original repo
Meaningful response for update query use case
New configuration system for the database
New use case for showing the chart. Using new library for creating charts
Added current query in the chart title
Merge branch 'master' of github.com:fiunchinho/seo-tools
Issue #4 Error on duplicated rows
Added new tabulated data to the chart
Improving error messages
Merge branch 'master' of https://github.com/fiunchinho/seo-tools