make line-summary as sub-command

[zlx]

make line-summary as sub-command for summary with option --line

example:

$ git summary --line

is equal to

$ git line-summary

[hemanth]

@zlx Any specific reason behind this?

[zlx]

line-summary and summary are both command for summay the information of the project. and the output is about and about. the only different is only: the summary is base on commit, the line-summary is base on line. So I think it's better to merge them into one.

[hemanth]

Got it. Now we would have git-line-summary and git summary --line ?

[zlx]

Yes, the git summary --line is euqal to git line-summary, which is the origin command.

[hemanth]

Any specific use case where the flag will be useful, rather than just line-summary ?

[zlx]

maybe @visionmedia can answer, ref from #172

[hemanth]

@zlx Found a clue to this in one of the man pages, thanks.