Remove unnecessary require from active_support/inflector/methods.rb

`active_support/inflections` already requires
`active_support/inflector/inflections`. There's no need to require it in
`active_support/inflector/methods`.
change to destructive `deep_symbolize_keys` after https://github.com/rails/rails/commit/df24b8790f22384a068fece7042f04ffd2fcb33e which allows to do so. This helps to avoid extra hash object creation, by symbolizing inplace
make "rails dbconsole" work with activerecord-postgis-adapter
Update filter_parameters related docs, as they have been moved to initializers.
Update configuration docs for assets.enabled, as it's set true by default in the configuration and doesn't appear in the config files anymore.
update_counters accepts a hash, not an array of hashes
Documentation: Notifications queue does not run in a thread.
In rails 4 there are much more ways to retrieve a single object
Compare with the parsed result from REXML backend
Added an example for primary_key option
Add test for AR::CounterCache.update_counters
Refactor AR's counter_cache_test.rb test
HashWithIndifferentAccess#select working as intended

Before this commit, #reject returned a HashWithIndifferentAccess,
whereas #select returned a Hash. Now #select also returns a
HashWithIndifferentAccess.
enhanced comments for foreign_key_present? method
correction on cache.fetch race_condition_ttl
Merge pull request #138 from lifo/cache

correction on cache.fetch race_condition_ttl
Correct the assertion that join table columns have no options, mind context.
removes forgotten avatar
minor comments cleanup
Fixed quotes in environment example in Rails Application Templates guide.