Shutdown fixes

delay websocket shutdown callback (#75)

This is similar to https://github.com/awslabs/aws-c-http/pull/72

Websocket's `on_connection_shutdown` callback shouldn't fire during the handler shutdown, it should fire during the channel's shutdown.

This change clarified some questions I had about lifetime/ownership (hence the deleted TODOs and modified API comments)

Fix shared-lib builds

v0.2.16

fix shared lib builds (#67)

Remove fpic from old linux build.

v0.2.15

We don't need the fpic version of libcrypto anyways, we're building a…

more release CD

v0.2.14

in bash the list arguments need to be quoted. (#58)

more CD release crap

v0.2.13

sigh.... this sux. (#57)

codebuild cd script update

v0.2.12

Fixed codebuild script to use codebuild style artifacts from codepipe…

More CD script fixes.

v0.2.11

Fixed the batch file again... (#55)

Cd script updates

v0.2.10

improvements to batch script. (#54)

kick CD pipeline with new scripts.

v0.2.9

aws_websocket_convert_to_midchannel_handler() (#52)

Fixed aws-c-compression dependency

v0.2.8

I forgot the thing (#47)