uvloop alpha release

[1st1]

Some ToDo items we need completed before we make an alpha release:

• Implement loop.create_connection
• Add few more tests for loop.create_server to increase the coverage
• Add a few high-level tests involving aiohttp or another real codebase
• Implement loop.create_unix_server
• Implement loop.create_unix_connection
• Implement loop.subprocess_shell and loop.subprocess_exec
• Implement loop.getnameinfo
• Implement loop.add_signal_handler and loop.remove_signal_handler
• Implement loop.connect_read_pipe and loop.connect_write_pipe
• Implement SSL
• Implement loop.create_datagram_endpoint

[1st1]

Added basic loop.create_unix_server in b1c130b

[1st1]

Added tests for loop.create_unix_server in c93da26

[1st1]

Added support for sock parameter to loop.create_unix_server in 55228cb

[1st1]

Added basic implementation of loop.create_connection in e6f1d45 and a626675.

TODO: Add tests.

[1st1]

Added basic implementation of subprocess* functions in 800cde0

[1st1]

Implemented loop.connect_read_pipe and loop.connect_write_pipe in e293b28

[1st1]

loop.subprocess_shell and loop.subprocess_exec are almost done (see 1f4e720, 704eb6f, 5bcb103, and 28d166e)

[1st1]

loop.subprocess_shell and loop.subprocess_exec are done now (see 91d17cd and b8c410a)

[1st1]

Solved bunch of small issues and implemented create_unix_connection in 203a181

[1st1]

loop.getnameinfo has landed in 4b94712

[1st1]

5457d1e implements loop.add_signal_handler and loop.remove_signal_handler

[1st1]

SSL landed in 2ed225e and 4948947

[1st1]

UDP landed in deff28d

[1st1]

Almost there. Will release an alpha version officially in a day or two. /cc @sametmax @asvetlov