Update Gemfile.lock: Change version of chunky_png 1.2.8 -> 1.2.9
Replace awesome font with a subset of icomoon

Mainly social network icons: twitter, github, linkedin, g+ and tux, apple
Fix infinite regeneration 1 files changed after rake watch or rake preview

Using directory_watcher gem version 1.4.1 fixes this issue

Cf. https://github.com/imathis/octopress/issues/1329#issuecomment-23504546