fix interface to libsml (ignore string entries, report correct number of readings), added basic unit test for MeterSML. Includes unit test for Obis and fix for Obis (isxdigit -> isdigit and ...)
Merge pull request #68 from mbehr1/fix_libsml_interface

fix interface to libsml and updated obis parsing
Fix local http server always enabled and triggering daemonize
fixed typo
Merge pull request #69 from andig/fix-daemonize

Fix local http server always enabled and triggering daemonize
Added null api for not pushing readings to any consumer. Renamed channel->protocol to channel->api for clarity.
Merge pull request #70 from andig/nullapi

Added null api for not pushing readings to any consumer.