Fixes for mqtt and iOS check

• BUG_FIXED: Fixes a crash when shutting down an mqtt connection with an incomplete request with no callback from aws-c-mqtt
• BUG_FIXED: Fixes the iOS platform check on OSX
• BUG_FIXED: Fixes possible crash If the underlying http_message get destroyed before the destructor of HttpMessage. (which was included by v0.10.0, added it to release note here)
• BUG_FIXED: Crash fix caused by passing null into a shared_ptr reset

iOS API adjustments

v0.10.0

Updated version to v0.10.0

Auth signing change

• API CHANGE: AwsSigningConfig.SetSignedBodyValue() now takes string instead of enum

Checksums cmake fixes

• fixes cmake config for aws-checksums

Websocket close time out task

v0.8.11

Updated version to v0.8.11

MQTT bug fix

• Improved Mac-Only TLS log for private key in aws-c-io
• Solve the race condition from aws-c-mqtt

Signing updates

• Updated auth implementations against signing interface changes

X509 Credentials Provider binding

• Adds a binding to the x509 credentials provider. The v2 pub sub example has also been updated to illustrate its usage.

Updating several submodules, fixing test resource copy

v0.8.8

Updated version to v0.8.8

Windows 7 TLS fixes

v0.8.7

Updated version to v0.8.7