Add new Resources File Module by @nickhodge.

• Change dependency SWAN to Lite version
• Upgrade codebase to C# 7.1

• Added support for web socket routing #124
• New callback to handle 405 HTTP responses #123

Workaroud issue Firefox WebSocket #96

Resolved issue #103 .

Resolved issue #98 and restored .NET Framework 4.7 as target.

Fixed issue with CloseAsync

Fixing issues with performance. Avg 100 req/sec getting index.html @ Sample App.

• Resolved Issue #89
• Removed PROXY and AUTHENTICATION segments.
• Resolved some StyleCop issues.
• Refactored some classes to reduce responsibility.

• Upgrade NET frameworks target to 4.6 and 4.6.2.
• Upgrade Solution to VS2017
• Fix issue #47

Minor changes, see commit logs

Fixed issue #74