Use ruby-mode for Podfile

A Podfile is used for CocoaPods to do a Bundler like dependency
management in XCode projects. Similar to a Rakefile or a Gemfile the
Podfile contains a dependency description in a Ruby based DSL.
Merge pull request #473 from jehrhardt/podfiles

Use ruby-mode for Podfile
Factor the search engine installation to ease the future install of new ones.
Add DuckDuckGo search engine in the default list.
Add binding `C-c U` for DuckDuckGo search
Merge pull request #476 from ardumont/add-duckduckgo-search-engine

Add DuckDuckGo to the search engines list
web-mode is now compatible with minor modes
Merge pull request #485 from bixuanzju/patch-1

web-mode is now compatible with minor modes
[Fix #484] Set OS X specific latex settings conditionally
Merge remote-tracking branch 'refs/remotes/bbatsov/master'

* refs/remotes/bbatsov/master:
  [Fix #484] Set OS X specific latex settings conditionally
  web-mode is now compatible with minor modes
  Add binding `C-c U` for DuckDuckGo search
  Add DuckDuckGo search engine in the default list.
  Factor the search engine installation to ease the future install of new ones.
  Use ruby-mode for Podfile
FIX: `coffee-mode` uses `coffee-tab-width` instead of `tab-width`.

And recently it has removed `tab-width` dependency completely.
Merge pull request #493 from pokehanai/hotfix/coffee-tabwidth

FIX: `coffee-mode` uses `coffee-tab-width` instead of `tab-width`.
Merge remote-tracking branch 'refs/remotes/bbatsov/master'

* refs/remotes/bbatsov/master:
  FIX: `coffee-mode` uses `coffee-tab-width` instead of `tab-width`.