remove unnecessary trailing spaces in documentation
correct typo in documentation
add "gsi" alias for "git status --ignored
Add tab completion for bash git aliases (e.g. go)

Based on work at
http://git.661346.n2.nabble.com/Bash-tab-completion-for-git-fetch-alias-is-broken-on-Git-1-7-7-1-td6980366.html#message6988430
Enable tab completion on bash aliases, e.g. "go" instead of
"git checkout"

Fixes #1
update git-completion.bash to latest version
remove alias gbo

I find "go -b" is just as fast and more intuitive than "gbo"
modify 'gb' alias to 'git branch' with no params

Previously 'gb' mapped to 'git branch -a -v', this lead to issues with
parameters that conflict with '-a'. For example 'gb -d branchname' did
not work.

Therefore, 'gb' now maps to 'git branch' with no parameters and 'gbv'
has been added for 'git branch -a -v'

Fixes #2