Issue #70: refactoring enrollment pdfs to use helpers
Issue #54: Removing unnecessary line break and breaking line for footer
Issue #41: aligning fields in enrollments pdf
Issue #70: refactoring enrollments controller. Moving pdf logic to view
Issue #70: refactoring scholarships controller. Moving pdf logic to view
refactoring scholarship durations controller. Moving pdf logic to view
refactoring course classes controller. Moving pdf logic to view
Issue #70: refactoring advisements pdf and adding license header to all prawn files