feature(Poll): add poll support

* Some portions developed by Andri Yngvason (any1)
perform a gitsubmodule update automatically
Merge pull request #439 from luvit/features/poll

add poll support to luvit
Merge pull request #453 from luvit/fixes/checkout_cares

perform a gitsubmodule update automatically
add luv_poll.c to gyp
Merge branch 'master' of github.com:luvit/luvit
point the travis image to the master branch
bump openssl
Merge pull request #455 from luvit/fixes/bump_openssl_1_0_1g

bump openssl