plugin : updated airline

Signed-off-by: BlackEagle <ike.devolder@gmail.com>
plugin : updated syntastic

Signed-off-by: BlackEagle <ike.devolder@gmail.com>
plugin : updated tagbar

Signed-off-by: BlackEagle <ike.devolder@gmail.com>
plugin : updated undotree

Signed-off-by: BlackEagle <ike.devolder@gmail.com>