Added vim-gitgutter

Signed-off-by: Thameera Senanayaka <thameera123@gmail.com>
Bundle 'Lokaltog/vim-easymotion'

Signed-off-by: Thameera Senanayaka <thameera123@gmail.com>
zshrc: History search, HISTSIZE, mv -i, etc

Signed-off-by: Thameera Senanayaka <thameera123@gmail.com>