_import_package: + notes and helps for newbie
Clean up code to avoid nested block
Use :TheSmallBang as default

:TheBigBang is quite big, and we because it is big,
it may make users confused. TheSmallBang is really simple,
and its rules will never be out-of-date, and we do not
need to merge/rebase. TheSmallBang is freeze, it should never
be updated in any situation, while :TheBigBang is developed
and it is used to provide the latest development guides.

I do not why people call it the :Big. The space is too small,
it can not be big. Let us give it a new name :)
Auto. check out :TheSmallBang to local dir.

This branch is important to start/build package, and we
can help developers to check it out automatically