Updated link to to GitHub article about ignoring files [ci skip]

- http://help.github.com/ignore-files redirects to https://help.github.com/articles/ignoring-files
Merge pull request #10476 from prathamesh-sonpatki/gitignore

Updated link to to GitHub article about ignoring files [ci skip]
use nokogirisax as a backend

Most likely someone just forgot to change it during copying and
pasting test cases from nokigiri engine test.
Merge pull request #10467 from akalyaev/set-correct-backend-for-nokogirisax-engine

use nokogirisax as a backend
use destructive sort on array in Hash#to_param for performance gains.
Check https://gist.github.com/vipulnsward/6aad158c06a22f931a71 to see the gains.
use canonical #controller_path logic in controller test cases
Fix typo in documentation comment
Merge pull request #10480 from juno/fix-typo

Fix typo in documentation comment [ci skip]
Merge pull request #10453 from vipulnsward/destructive_sort

Speed up Hash#to_param by switching from #sort to #sort!
Allow fetching multiple values from the cache at once

Add a simple API for fetching a list of entries from the cache, where
any missing entries are computed by a supplied block.
Instrument template compilation
remove unused variable
Merge pull request #10486 from vipulnsward/remove_variable

remove unused variable
raise IrreversibleMigration if no column given

fixes #10419

Following code should raise  IrreversibleMigration. But the code was
failing since options is an array and not a hash.

def change
  change_table :users do |t|
    t.remove_index [:name, :email]
  end
end

Fix was to check if the options is a Hash before operating on it.
Merge pull request #10437 from neerajdotname/10419

raise IrreversibleMigration if no column given
let rake tasks be robust to a missing RDoc in Rubinius [Fixes #10462]

See the comment in the rescue clause towards the top of the patch for the rationale.
fix failing test caused by 3771e4d511
Merge pull request #10488 from neerajdotname/10419-b

fix failing test caused by 3771e4d511
Fix bug in ActiveRecord::Sanitization#sanitize_sql_hash_for_conditions

Fixing CHANGLOG description

Remove extra line.

Remove blank lines.
Merge pull request #10352 from zohlgren/fix_activerecord_sanitization_sanitize_sql_hash

Fix bug in ActiveRecord::Sanitization#sanitize_sql_hash_for_conditions