Display exceptions in text format for xhr request
Making proper_table_name take in options.

The options will specify the prefix and the suffix. Also, I'm moving the
method to be an instance method on the +Migration+ instance. This makes more
sense than being a class method on the +Migrator+ class because the only
place that uses it is on a +Migration+ instance (in a method_missing
hook). The logic for the Migrator shouldn't be doing any work to
calculate the table name, it should be the Migration itself.

Also made some small indentation fixes.
Add a note about edge guides in the feedback section[ci skip]
Merge pull request #11991 from prathamesh-sonpatki/note-edge-guides

Add a note about edge guides in the feedback section [ci skip]
remove unused instance variable
Merge pull request #11994 from rajcybage/fix_instance

remove not used instance variable
Fix typo in file path, should include extension.
Merge pull request #11996 from semaperepelitsa/master

Docs: fix typo in file path, should include extension. [ci skip]
cleans the guides sources from fancy non-ASCII stuff
Deprecating passing strings as class name in fixtures.
Merge pull request #11960 from kirs/xhr-errors

Show exceptions in text format for xhr requests
typo [ci skip]
Merge pull request #11984 from wangjohn/proper_table_name

Making proper_table_name take in options.
Merge pull request #12000 from wangjohn/deprecating_class_name_string_in_fixtures

Deprecating passing strings as class name in fixtures.
Adding deprecation assertions for proper_table_name.

This prevents deprecation warnings from popping up.
Merge pull request #12008 from wangjohn/skipping_deprecated_migration_tests

Skip tests using deprecated +proper_table_name+ method.