add more scenarios

[ericsciple]

fixes #100
fixes #99
fixes #91
fixes #81
fixes #61
fixes #45

[wei]

@ericsciple could you kindly comment or add a scenario that matches the behavior of v1? Would it be doing the last two scenarios sequentially or is there a simpler command to get all in one line?

[ericsciple]

@wei git fetch (without any additional args) will fetch all branches and tags from origin

the only reason a i listed the long form was so that folks could easily modify the command to fetch a more specific subset of tags or branches (better perf for large repos)

[ericsciple]

also git fetch docs are good