1.0.0-rc4

Fix some problems:

• commands can now be string or array
• same for env_files
• environment can now be written with "equal" form or object form
• if the image name is not set in one service, Katenary stops and ask to add an image name
• the chart directory is no emptied only if there is no common errors (some others error can happen)
• env files were not written as configMap, this is a regression, it's now fixed