replaced default_engine by get_default_engine
deleted unused global instances of template loaders
added engine argument to BaseLoader constructor; restored caching in cached.Loader
calculating template loaders based on settings moved away from TemplateEngine
added TemplateEngine.add_library method
fixed bug in cache loader
rewritten custom.CustomFilterTests.test_filter
rewritten custom.CustomTagTests.test_simple_tags
rewritten custom.CustomTagTests.test_simple_tags
rewritten custom.CustomTagTests.test_simple_tags
rewritten custom.CustomTagTests.test_simple_tag_missing_context
rewritten custom.CustomTagTests.test_inclusion_tags
rewritten custom.CustomTagTests.test_include_tag_missing_context
rewritten custom.CustomTagTests.test_inclusion_tags_from_template
rewritten custom.CustomTagTests.test_15070_current_app
rewritten custom.CustomTagTests.test_15070_use_l10n
rewritten custom.CustomTagTests.test_assignment_tags
rewritten custom.CustomTagTests.test_assignment_tag_missing_context
rewritten verify tag tests in custom.CustomTagTests
added passing template engine to nodes of base.Library (like InclusionNode)