Merge branch 'master' into 'develop'

.gitignore

tests/data/scanned_pdfs/blank.jpg

tests/data/scanned_pdfs/jamy1.jpg

tests/data/scanned_pdfs/jamy2.jpg

tests/data/scanned_pdfs/latex1.jpg

tests/data/scanned_pdfs/latex2.jpg

tests/data/scanned_pdfs/latex3.jpg

tests/data/scanned_pdfs/latex4.jpg

tests/data/scanned_pdfs/latex5.jpg

tests/data/scanned_pdfs/latex6.jpg

tests/data/scanned_pdfs/messy_three_corners.jpg

tests/data/scanned_pdfs/missing_two_corners.jpg

tests/data/scanned_pdfs/sample_exam.jpg

tests/data/scanned_pdfs/shifted.jpg

tests/data/scanned_pdfs/tilted.jpg

tests/test_rotation_scan.py

zesje/statistics.py