Part 1 of #116 - ignore missing properties in output templates, default to "l" (literal formatting) for strings unless other formatting is specified.
Suppressed a couple of distracting but unimportant warnings in sample code.
Brought a couple of conventions in the Splunk sink in line with the other sinks. Obsoleted the interface-based configuration type; using the concrete type will be better for evolution. Seems like there's a good opportunity to use JsonFormatter to get more interesting data into this one.
Merge branch 'master' of https://github.com/serilog/serilog