add test-case for `Array#to_sentence with blank items.
Merge pull request #10763 from senny/10758_to_sentence_with_blank_elements

test-case for `Array#to_sentence` with `blank?` items.
Minor refactor of ActiveRecord::SchemaMigration to remove references to Base, override table_exists method, and switch to preferred style for class method definitions.
Correct the assertion that join table columns have no options, mind context.
removes forgotten avatar
cleanup whitespace in `active_record/relation.rb`.
minor comments cleanup
`implicit_readonly` is being removed in favor of calling `readonly` explicitly
Merge pull request #10769 from senny/10615_join_should_not_return_readonly_records

using `#joins` does not imply `readonly = true`.
Fixed quotes in environment example in Rails Application Templates guide.
Use Range#cover? for Numeric ranges (tests via endpoints) and use Range#include? for non-numeric ranges

added changelog message
test cleanup, replace `define_method` and `remove_method` with stubs.
End-of-line whitespace hunt
Consistent use of one space only after punctuation
Remove double spaces in code examples
Remove double spaces in guides
Remove references to deprecated test tasks
Merge pull request #10775 from senny/postgres_adapter_test_cleanup

test cleanup, replace `define_method` and `remove_method` with stubs.
Consistent one-spaced bullets in guides release notes
Whitespace trimming in guides generation