Update prelude-lisp.el

Use `completion-at-point` since `lisp-complete-symbol` is obsolete as of Emacs 24.4.
Merge pull request #465 from bixuanzju/patch-1

`lisp-complete-symbol` is obsolete
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
add personal tweak as SublimeText2 Keybindings
massive update
set default tex engine to xelatex
cleanup mode
add indentguide
add snippets
add modes personal
google c style
use solarized theme
add snippets for dot-mode and cc-mode
change s-j to join-region
cleanup