Fix template header file
Fix action processor

We may return positive return values from special commands.
Add stub for jump command
Return -errno insead of return value in connector.c
Add implementation of jump command
Add values/utils.h header including interface definition
Add implementation for ws_value_is_nil()
Add implementation for ws_value_is_true()
Merge pull request #276 from neithernut/fix-read_write_invocations

Return -errno insead of return value in connector.c
Merge pull request #277 from matthiasbeyer/add-value_utils

Add some ws_value type utils
Merge pull request #275 from neithernut/add-command-jump

Add command jump
Add deserializer callback interface
Add deserializer callback source file (stubs) and CMakeLists.txt entry
Add implementation for NULL callback
Add implementation for boolean callback
Add implementation for integer callback
Add implementation for string callback
Add implementation for start_map callback
Fix: Name of a command must be assignable.
Add implementation of map_key callback