Indents documentation tests with blocks for hygiene.
Adds foldl and foldr templates to sequtils.
Removes executable bit for text files.
Merge pull request #364 from gradha/pr_fixes_unix_file_permissions

Removes executable bit for text files.
Merge pull request #362 from gradha/pr_adds_fold_templates_to_sequtils

Adds fold templates to sequtils