Fixed typo [ci skip]

singular is more suited to
change to "check out"
e-mail => email, and subject/verb agreement
add punctuation
Remove duplicate configuration option for ActiveSupport [ci skip]

Fixes rails/rails#13732
`requies` => `requires`
`easiy` => `easy`
`framwork` => `framework`
Remove old comments about suppressing warnings.
Upgraded jquery-rails gem version
Remove obsolete line (was needed for Ruby 1.8.7 support)
Remove obsolete test (builtin group_by is now used)
Strengthen test with different nb of rows and columns
Return sized enumerator from Batches#find_in_batches
Return sized enumerator from Batches#find_each
Return sized enumerator from Enumerable#index_by
Merge pull request #13938 from marcandre/sized_enumerator

Sized enumerator
fix interplay of humanize and html_escape
Merge pull request #13953 from seanwalbran/fix-humanize-match-reference

fix interplay of humanize and html_escape
Fixed "Hash#to_param confused by empty hash values #13892"