Removed log4r-color and used Thor::Shell::Basic
updated to version 2.2.0
Merge branch 'persistent_cache' into dev

Conflicts:
	lib/kameleon/engine.rb
	lib/kameleon/persistent_cache.rb
	lib/kameleon/recipe.rb
remove old omnibus project from the main branch
Removed diffy from dependencies
Used Thorfile to build, install and release gem package
templates list display improved
Removed unused cli options
Improved context_out/in log readability
Do not run qemu with nohup
fix #15 : Enabled kvm only if available
Added download_file alias that used curl/wget or python to download file
added syck to Gemfile
Enabled debug mode with KAMELEON_DEBUG=1
Hide defaults kameleon state files
Used boot2kameleon.iso to bootstrap the out_context with a minimal linux system
updated debian7 virtualbox recipe with boot2kameleon
Fixed a bad merge with branch 'persistent_cache' into dev (commit 38221f9)
Improved CLI
Fixed persistent cache