Add test for string length when setting from literal
Use u_strlen() instead of own variable
Add note to documentation that ws_string_len() returns the number of characters
Merge pull request #386 from matthiasbeyer/fix-string_length

Fix: string length issue
Add interface definition + stubs for serializer
Add implementation for ws_serializer_json_serializer_new()
Add implementation for serialize() callback
Add keys for event serialization
Add interface + stubs + states for serializer state helper(s)
Add implementation for serializer_context_new()
Add helper for generating a new key in the buffer
Add implementation for serialize_event()
Add test file for serializer test
Add test for serializing a ws_message (which is not valid)
Add test for serializing an event