add flycheck packages

Signed-off-by: Micky Ching <mickyching@gmail.com>
add flycheck for python

Signed-off-by: Micky Ching <mickyching@gmail.com>
fix jump key setting

Signed-off-by: Micky Ching <mickyching@gmail.com>
add shortkey for insert TAB and SPC

Signed-off-by: Micky Ching <mickyching@163.com>
simplify search current word shortkey

Signed-off-by: Micky Ching <mickyching@gmail.com>