document Intercepters in ActionMailer guide
Fixes improper database name when a '.' is included while creating a new rails
application. EG: `rails new something.awesome.com`
Conflicts:
	railties/CHANGELOG.md
Fix date_select :selected option so you can pass it nil
Merge pull request #8965 from colinbm/date_select_value

Fix date_select :selected option so you can pass it nil
Merge pull request #8967 from senny/add_interceptor_to_am_doc

document Intercepters in ActionMailer guide
clear specific logs when using rake log:clear
Merge pull request #8964 from mattdbridges/specify-log-to-clear

Clear specific logs when using `rake log:clear`
Deprecate direct calls to AC::RecordIdentifier.dom_id and dom_class

Also add some generic tests to ensure they're properly deprecated.
clarify awkward sentence re: email testing
fix example of setting DEFAULTS in fixtures
Removing : warning: ambiguous first argument;
Merge pull request #8975 from arunagw/warning_removed_ambiguous_first_argument

Removing : warning: ambiguous first argument;
Remove useless || operation
spelling correction for AM interceptors
Merge pull request #8976 from senny/spelling_correction

spelling correction for Action Mailer interceptors
Fix ActionDispatch::Request#formats when HTTP_ACCEPT header is empty string
Remove i18n symbol dependency

date.order is the only key in rails i18n that is required to be a
symbol. This patch allows for symbols or strings which means:

* No requirement for symbol type in .yml files. A future
  YAML.safe_load wouldn't need to load symbols
* Rails could actually use json rather than yml as the backend
Don't change the original i18n data
repeating documentation for date and time form helpers
repeating documentation for option form helpers