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 logical.commands file
Add stubs for logical commands
Implement ws_builtin_cmd_logical_not()