Include ActiveRecord SQLServer Adapter by @metaskills in new application generator.

Thanks to the hard work of Ken Collins ( @metaskills ) on the ActiveRecord SQLServer Adapter ( https://github.com/rails-sqlserver/activerecord-sqlserver-adapter ), AR SQLServer Adapter works for Linux, OSX and Windows. Thus the sqlserver adapter should include so that users may use it with the new application generator:

    rails new w00t -d sqlserver ...

caching the http version.

The syntax for including an https image url in RDoc taken from
http://about.travis-ci.org/docs/user/status-images. Having this in a
line of its own now to make regex replacement for the API simpler!

* https://github.com/rails/rails:
  Postgresql adapter: added current_schema check for table_exists?
  Postgresql adapter: added current_schema check for table_exists?

Add ROWNUM to test first and last to support Oracle.

Refactor assets tests to use add_to_config

Fix assert_select_email to work on non-multipart emails as well as converting the Mail::Body to a string to prevent errors.

Make sure require_tzinfo only calls Kernel#require if TZInfo isn't alread

This wasn't a problem when require_tzinfo was only called from TimeZone#initialize, but now it's being called for every lookup to TimeZone.[] (via lazy_zones_map)

TimeZone lookup can occur when unmarshalling TimeWithZone objects, which is where I first saw the big slowdown (500ms for each Rails action that loaded from Rails.cache)

Fixing small typo in the `record_key_for_dom_id` documentation.

fix exists? to return false if passed nil (which may come from a missing 

Fixing `record_key_for_dom_id` documentation.

The default implementation joins everything with '_' and not with '-'

Patch for issue #2820

Database adapters use a statement pool for limiting the number of open
prepared statments on the database.  The limit defaults to 1000, but can
be adjusted in your database config by changing 'statement_limit'.

add has_key? to ActiveModel::Errors

Fix double slash at start of paths when mounting an engine at the root.

config.action_controller.perform_caching isn't used anymore in asset pipeline

config.action_controller.perform_caching isn't used anymore in assets pipeline, instead we are using config.assets.digest now

Nested through associations: preloads from the default scope of a through model should not be included in the association scope. (We're already excluding includes.) Fixes #2834.

Avoids double slash at start of paths when mounting an engine at the root.

Ensure we are not comparing a string with a symbol in HasManyAssociation#inverse_updates_counter_cache?. Fixes #2755, where a counter cache could be decremented twice as far as it was supposed to be.

Disable active record marshalling tests on Ruby 1.8.7 on Travis CI, as they have been failing intermittently for a long while due to what appears to be a Ruby bug. If anyone has the skills/expertise/time to debug this, please speak to the Travis guys.

#first doesn't take an order in this test

No need to use a begin block there

Uglifier bump