Merge pull request #1 from DigitalLogistics/master

Export Listen
Lowering version for internal Hackage release
Commit Changelog.md
Add a default-language and don't build a test executable
Use snap-cors for Example.hs
Implement heartbeat support
Heartbeats are functional - connections now stay open
Saner heartbeating; start watching for disconnections
Increase verison to 0.10.0 for internal Hackage
Correct handshake to have text/plain and a valid response
Export Message and encode/decode; improve error diagnostics
Add Eq instance to Message
Rewrite
Add on_
Use field selectors for Event
Bump dependency upper bounds: aeson, attoparsec, text
Merge pull request #2 from k0001/deps

Bump dependency upper bounds: aeson, attoparsec, text
Bump version number
Update default.nix
New API