Enabling persistent cache to cache file using pipe mechanisim
recipes and steps now are saved into the cache
Caching recipe with the persistent cache mechanism and cleaning code
Removed trailing whitespace (arg!)
updating persistent cache
Merge branch 'persistent_cache'

Conflicts:
	lib/kameleon.rb
	lib/kameleon/cli.rb
	lib/kameleon/context.rb
	lib/kameleon/engine.rb
	lib/kameleon/persistent_cache.rb
Grouping templates by container engines
Removed file log
Merging persistent cache
Adding missing methods
Added template virtualbox/debian7
Now recipe is stored in cache
Merge branch 'persistent_cache' of https://github.com/oar-team/kameleon into persistent_cache

Conflicts:
	lib/kameleon.rb
	lib/kameleon/cli.rb
	lib/kameleon/context.rb
	lib/kameleon/engine.rb
	lib/kameleon/persistent_cache.rb
Adding proxy_cache varible for context
Adding doc for persistent cache variables
Merge branch 'persistent_cache' into dev
Fixing the copy of recipe files into the cache. Modification of chroot and qemu debian templates for support persistent cache
Adding the kameleon variable persistent cache to be used on the recipes
Removed log4r-color and used Thor::Shell::Basic
updated to version 2.2.0