Add syslog results reporter

[macbre]

Send found issues as JSON messages via syslog. They can then be processed by automated issues reporting tools like jira-reporter.

See #35

syslog

import syslog

syslog.openlog(logoption=syslog.LOG_PID, facility=syslog.LOG_MAIL)
syslog.syslog('E-mail processing initiated...')

Dec 28 15:59:58 debian index-digest[17485]: {"meta": {"version": "index-digest v0.1.0", "database_name": "index_digest", "database_host": "debian", "database_version": "MySQL v5.7.20"}, "report": {"type": "redundant_indices", "table": "0004_id_foo", "message": "\"idx\" index can be removed as redundant (covered by \"PRIMARY\")", "context": {"redundant": "UNIQUE KEY idx (id, foo)", "covered_by": "PRIMARY KEY (id, foo)", "schema": "CREATE TABLE `0004_id_foo` (\n  `id` int(9) NOT NULL AUTO_INCREMENT,\n  `foo` varbinary(16) NOT NULL DEFAULT '',\n  PRIMARY KEY (`id`,`foo`),\n  UNIQUE KEY `idx` (`id`,`foo`)\n) ENGINE=InnoDB DEFAULT CHARSET=latin1", "table_data_size_mb": 0.015625, "table_index_size_mb": 0.015625}}}