add initial python2 bindings

Signed-off-by: xiehuc <xiehuc@gmail.com>
add python Event object

Signed-off-by: xiehuc <xiehuc@gmail.com>
add Event raw

Signed-off-by: xiehuc <xiehuc@gmail.com>
pybind add sync mode

Signed-off-by: xiehuc <xiehuc@gmail.com>
fix #475 add http handle delayed

Signed-off-by: xiehuc <xiehuc@gmail.com>