Ref #329 Created a dynamic threshold setting for how many cohorts' assessments should show up on the "Assessment Strategies". Defaults to showing all of them if the setting isn't in the database, but I set the default to 4 as designated in the ticket. Also made some pretty minor changes to how the Entrada_Settings class is used to make things a bit more smooth to use.
Ref #329 Added the assessment order as the secondary ordering parameter in the query for the assessments list on course websites.
Refs #329: Adds Entrada_Base class and adapts Entrada_Settings to extend Entrada_Base.
Brings feature-course-website-assessments-threshold in line with develop
Merge pull request #443 from EntradaProject/feature-course-website-assessments-threshold

Course Website Assessment Cohorts Threshold