Change C-c SPC to C-c j to avoid a conflict in org-mode

In org-mode C-c SPC is bound to `org-table-blank-field`
Bind ace-jump-mode to s-. as well
Mention guru-warn-only
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Use `completion-at-point` since `lisp-complete-symbol` is obsolete as of Emacs 24.4.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`lisp-complete-symbol` is obsolete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 evil mode and sr-speedbar
update personal settings
set font to monaco
add evil mode keybindings
add smart modeline
show all files in speedbar
create personal package list
keep syntax highlighting
add ruby syntax highlighting