Adds git alias to rebase current branch with master

[viniciusffj]

Adds the alias grbb that rebase the current branch with master.

This alias abstract the following:

$ git branch
  master
* my-feature-branch
$ git checkout master
$ git pull --rebase
$ git checkout my-feature-branch
$ git rebase master
First, rewinding head to replay your work on top of it...

So instead you'd only use:

$ git branch
  master
* my-feature-branch
$ grbb
First, rewinding head to replay your work on top of it...

[mb-dev]

ooo, I want that!

[kevin-verschaeve]

Why not using: git pull --rebase origin master on the my-feature-branch branch ?

If the alias is really needed, it can become

function rebase_with_master() {
    local b=$(git_current_branch)
    git pull --rebase origin master
}

So you do the same with only one instruction.

And because I rebase mostly on a develop branch, this can be improved like this:

function rebase_with_branch() {
    local b=$(git_current_branch)
    branch=$1
    if [ -z "$branch" ]; then
        branch="master"
    fi

     git pull --rebase origin $branch
}

and used like this: grbb develop or without argument, which will rebase to master.