fix bug
add .gitignore
add a submodule implicit-git-rm
add prejdk
Merge branch 'master' into linux/on-virtualbox
take new commits of implicit-git-rm
use implicit-git-rm
remove conflict mark
fix PS1

__git_ps1 is loaded when calling . /etc/bash_completion
Merge branch 'master' into linux/on-virtualbox

Conflicts:
	.bashrc
update Implicit-git-rm
Merge branch 'master' into linux/on-virtualbox
update .gitignore
Merge branch 'master' into linux/on-virtualbox
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