We also need to time zone convert time zone aware attributes when
accessed via read_attribute, not only when via direct access.

Rationale: As discussed with José and Jon, this convenience
shortcut is not clearly justified and it could let the user
thing the disabled EXPLAINs are related to the model instance
rather than being globally disabled.

reintroduce patch from #726 to handle nested eager loading via associations

Use show create table (fix 3678: third time).

App Generator test

Revert html_escape to do a single gsub again, but add the "n" flag (no
language, i.e. not multi-byte) to protect against XSS via invalid utf8
Signed-off-by: NJosé Valim <jose.valim@gmail.com>

indentation fix warning

This reverts commit f6b50463.

Fear not, the roflscale will return when I have a bit more time and
figure out a better way to do it. (In particular, a way that doesn't
break the build.)

Don't prefix the name with attribute_. Avoids a string allocation on
read_attribute, which is a bit faster.

This means we never have to rely on define_method (which is slower and
uses more memory), even when we have attributes containing characters
that are not allowed in standard method names.

(I am mainly changing this because the duplication annoys me, though.)

Also make it actually work.

It slows down all read_attribute accesses to map 'id' to whatever the PK
actually is, inside read_attribute. So instead make sure the necessary
methods are defined and that they redirect wherever they need to go.

This is good because it reduces duplication.

This makes me happy!

Define singleton methods on the attributes module instead. This reduces
method pollution on the actual model classes. It also seems to make
something faster, I am unsure why! O_o