New windowing + larger io messages by default (awslabs#213)

* New windowing + larger io messages by default
* Explanatory comment

Cached provider binding (awslabs#211)

* Cached provider binding
* Auth version bump
* Java doc + regen all docs

Update io, http, auth (awslabs#210)

Update c-io to diagnose secure channel tls issue (awslabs#206)

Updated docs (awslabs#204)

Auth revamp (awslabs#201)

* Revamp of Auth's signing interface

Make sure windows always builds with a config to avoid debug DLL depe…

…ndencies (awslabs#203)

* Make sure windows always builds with a config to avoid debug

* Force windows to specify buildconfig

* Fixed RelWithDebInfo config output dir on windows

* Removed erroneous assertion that EVERY HTTP request get a 200

Add monitoring and idle connection reaping support (awslabs#202)

* Monitoring and idle connection reaping support

X509 Proxy support (awslabs#200)

* X509 Proxy support

X509 credentials provider binding (awslabs#196)