make kameleon compatible with the old recipes
Added Debian 7 dev appliance with OAR-2.5
Added Debian 7 vagrant base box
Fix #10 : Added the lazy context initialization
Fix cleanup context
Fixed debian7 for grid5000 recipe
Removed incomplete debian7-arm template
Update .env
Added source_root command that prints the kameleon source directory path
Prepand _ to kameleon.zsh to make zsh autocompletions works
Publish docs to our own server
Used childprocess for interactive shell session
Don't create directory if it's root (/)
Set the variable KAMELEON_WORKDIR for all contexts
Do not initialize a default context workdir
Loaded shell variables of the context when sending a file
Use KAMELEON_WORKDIR when working with PIPE
improve prompt message  when importing recipes