Merge pull request #65 from smirfolio/master

Add histogram stats on checkbox term
Ui enhancements
Updated the protos - changes are related to StudySummaryDto
Merge pull request #66 from kazoompa/modified-protos

Updated the protos - changes are related to StudySummaryDto
Add charts module
Implementation of charts in study variable search page
add drush command to download Highcharts lib
add a download Highcharts lib in make file
Enhance Ui
add show more/less button
Ui enhancements
Merge branch 'features/chart_integration'