ported test from pull request #2071 to master

Patch for https://github.com/rails/rails/issues/2059

Cache key was incorrectly using timezone-dependent record#updated_at when it should be using a timezone-independent value to generate the cache key

Minor refactoring to cache_key timezone test

Closes #2059

Adds a test to validate the format of the cache_key for nil and present updated_at values

Correctly handles updated_at == nil

Bugfix by stopping find_in_batches using the records after yielding.

missing magic comments

treat fullwidth whitespace as a blank character

assets.cache_store now defaults to filesystem. You will want to share tmp/assets_cache between deploys.

Fix for SqlBypass session store (for master)

Fixed session ID fixation for ActiveRecord::SessionStore (for master)

remove extra space since comment_if already returns the space.

Two issues fixed:
1) connection_pool is not defined - needed by SessionStore#drop_table!
and create_table! since c94651f8

2) initialization of connection to the default of AR::Base.connection
only occurred at the singleton level - the instance level method defined
by cattr_accessor did not have this logic

I have found that Rails will take an invalid session ID specified by the
client and materialize a session based on that session ID. This means
that it is possible, among other things, for a client to use an
arbitrarily weak session ID or for a client to resurrect a previous used
session ID. In other words, we cannot guarantee that all session IDs are
generated by the server and that they are (statistically) unique through
time.

The fix is to always generate a new session ID in #get_session if an
existing session cannot be found under the incoming session ID.

Also added new tests that make sure that an invalid session ID is never
materialized into a new session, regardless of whether it comes in via a
cookie or a URL parameter (when :cookie_only => false).

Fix failure in test_preserves_existing_fixture_data from test/cases/fixtures_test.rb when UTC and local time occur on different dates.

Signed-off-by: NSantiago Pastorino <santiago@wyeworks.com>

Make "select" helper handle nested collections

Fix xmlschema output with fraction_digits >0 

FormBuilder#select now works with a nested data structure.

#many? - uses count instead of select

Current implementation produce incorrect output when Time#usec returns
integer < 100000, because to_s doesn't add leading zeros.

TODO fix explicitly loading exceptations, autoload removed

Mention about acronym inflection in config/initializers/inflections.rb

Closes #1366

Create a test case for disable_referential_integrity

MemcacheStore: deserialize the entry reading from local_cache when using 

Resubmitting issue #636 as a pull request

Put back Rails.application#env_default and deprecate it [Closes #1922]

Log instrumentation name for exists? queries