added prevalence chart plus table
added seed data for prevalence rates report
corrected some variable naming #97
report link in breadcrumb #97
corrected seed data, updated report link for breadcrumb #97
Merge branch 'prevalence-report' of https://github.com/ilabafrica/iBLIS into prevalence-report
section_id->test_category_id in seed data #97
Refactored ReportController::prevalenceRates()
Refactored ReportController:getMonths() and getPrevalenceRatesChart()
Moved some functions to TestType. Rewrote some 'raw' db inputs to use ORM
refined prevalence report #97
added snippets of code from @mapesa for better report
fixed merge conflicts
Largely localization and enforcing code standards.
Merge pull request #130 from ilabafrica/prevalence-report

Prevalence report