remove_method tests and changes

Remove redundant blank line at the bottom of generated controller code

The output in Travis is a bit different. The SQLite
documentation (http://www.sqlite.org/eqp.html) warns
output may change dramatically between releases. I
do not want to mock the result set because I want a
real EXPLAIN to happen. I prefer a test that may fail
in future releases than a test that may give false
positives in future releases.

Removed argument throwing warnings when running tests

The last argument to DateTime.new/civil is the Julian day number for
when the calendar reform occured. DateTime ignores it if it's 0, and
sets it to the default of DateTime::ITALY instead, so we could just
leave it out. This also removes the warnings while running the
ActiveSupport tests (there still are some for the setup though).

Fix postgres adapter to handle spaces between schemas

Make pluralize follow singularize's logic of uncountability check

The bug is that an error would be raised while attempting to convert a
template from one encoding to another.

Please see http://redmine.ruby-lang.org/issues/5564 for more details.

The workaround is to load all conversions into memory ahead of time,
and will only happen if the ruby version is *exactly* 1.9.3p0. The
hope is obviously that the underlying problem will be resolved in
the next patchlevel release of 1.9.3.

This reverts commit 10773f94.

Refactored pluralize and singularize into a common method

See diff discussion on rails/#3536.

Update ActiveRecord#attribute_present? to work as documented

"Returns true if the specified attribute has been set by the user or by
a database load and is neither nil nor empty?"

Fixes #1613

This is a first implementation, EXPLAIN is highly
dependent on the database and I have made some
compromises.

On one hand, the method allows you to run the most
common EXPLAIN and that's it. If you want EXPLAIN
ANALYZE in PostgreSQL you need to do it by hand.

On the other hand, I've tried to construct a string
as close as possible to the ones built by the
respective shells. The rationale is that IMO the
user should feel at home with the output and
recognize it at first sight. Per database.

I don't know whether this implementation is going
to work well. Let's see whether people like it.

Add arel to Gemfile on apps generated in edge Rails

Fixed an issue id false option is ignored on mysql/mysql2 (fix #3440)

This reverts commit 6aaae3de, reversing
changes made to fdbc4e5f.

Reason: build failure.

This test is affected by a bug in Ruby 1.9.3p0 and trunk:
http://redmine.ruby-lang.org/issues/5564

Given we cannot fix it for ourselves, it is better to skip for now so
that we will easily see if further failures are introduced.

Jon Leighton is monitoring the bug report and will revert this when a
suitable solution is found (either a new Ruby release or a generic
workaround).

If you are using 1.9.3 in your app and have templates that are not in
UTF-8, you should add a workaround early on in the boot process. For
example, if your templates are Shift_JIS encoded, then add the
following in an initializer:

Encoding::Converter.new('Shift_JIS', 'UTF-8')

Remove warnings by calling remove_method