MacOS entry in installation guide
minor fixes in Mac OS installation guide suggested by @peterbe and @selenamarie
Merge pull request #1197 from GabiThume/master

Adding an entry about MacOS in installation guide
removed dots from processor name to appease statsd
Merge pull request #1204 from twobraids/statds_anti_dot_campaign

fixes bug 854511- removed dots from processor name to appease statsd