Use quoted_table_name with arel.from() if no from values explicitly supplied. Arel seems to be spending a lot of time figuring out the FROM value otherwise.

Signed-off-by: NJoshua Peek <josh@joshpeek.com>

Signed-off-by: NJosé Valim <jose.valim@gmail.com>

Conflicts:
	actionmailer/lib/action_mailer/base.rb

AS Xml and Json parsers expect the request body to be a real IO object
supporting methods like getc or ungetc which are not specified by the
Rack spec and aren't supported by Passenger or the Rewindable input
wrapper.

We can restore functionality if the AS parsers are rewritten to support
Racks subset of supported IO methods.