Add: tool to filter out local maxima
simplify the GridMinimum interface
Merge pull request #608 from chambbj/simplify-grid-minimum

simplify the GridMinimum interface
Merge pull request #604 from chambbj/add-local-max-tool

Add: tool to filter out local maxima
Add: tool to find grid minimums
Merge pull request #603 from chambbj/add-grid-min-tool

Add: tool to find grid minimums