Update screenshot paths to use the raw.github.com
Delete unused submodules.
 travis-ci: Create continuous integration configuration
do not build the 'master' branch in travis-ci [ci skip]
Fix #13: Make Irony-Ac works with any known YASnippet ATM

The following versions of YASnippet have been tested and work:
- 0.1.1
- 0.2.3
- 0.5.4
- 0.5.7
- 0.5.10
- 0.6.0b
- 0.6.0c
- 0.6.1b
- 0.6.1c
- 0.8.0 (beta)
Fix minimum version of YASnippet introduced in abbea83
Fix travis-ci build status and simplify YASnippet version requirements.
Fix #20: Introduce CONTRIBUTING.md
Remove redundant contribution intructions created in cc195f4
Update documentation.
Plugin rewrite [WIP]: Move plugins, merge ac & ac-simple
- ATM only the new ac plugin will work, the other will come soon
- Now the syntax to require a plugin is less messy and require only to
  add 'irony-mode/elisp' to the load-path. Plugins can be 'required'
  like this:
  (require 'irony/ac)
AC Rewrite: Merge (and fix) header-comp into ac
Update documentation according to the recent modifications.
Update SimpleJSON (contains some fixes for MacOSX Lion).
small cleanup, make eproject works again, document plugins
Compilation DB: Adapt irony-cmake to the new plugin scheme
Remove duplicates in header search directories
Header-Comp: delete-dups & re-trigger completion for directories
rename badly named variable (missing irony- prefix)
irony-completion: trigger completion for preprocessor stmt