[Container] Improve Service generator

[Haehnchen]

Some Feedbacks and ideas, also from #77 and improvements also in #470:

• support all tag interfaces on http://symfony.com/doc/current/reference/dic_tags.html
• File write: similar like translation extractor
• Yaml / XML coice should be inferred by looking into the config folder for xml/yml files
• Make the name configurable, right now it uses the complete folder structure: i would expect AcmeDemoBundle to generate a prefix of: acme_demo.
• Amazing. Now... what for an update-service command?
• Fomatting and file insert: Respect formatting for generated service definitions #374

[mablae]

Would it be possible to read the tabs/spaces setting from project settings and use that setting in the service generator? ATM you always have to manually re-indent them to spaces.

[Haehnchen]

yaml indention with 0.12.x only; related #626

[Haehnchen]

@mablae done by using file scope, fallback on space #736: Indentation must be done with one or more spaces