Extend aim log flags with syslog levels.
Add syslog macros with documentation parameter.
Add a SupportHeader generation option.
- This allows the enumeration to be defined in a useful place while all the
  boilerplate support definitions can be hidden in a different file.
Add AIM_LOG_BIT_SYSLOG_* bits to the baseline log settings.
Support Object Tagging

Object lists for generation can be specified using the special 'tag' key in addition to the ALL keyword.
Merge into master from pull request #33:
Extend aim log flags with syslog levels. (https://github.com/floodlight/infra/pull/33)
Add brackets around module name per controller team request.
Do not print flag name in log message.
Merge into master from pull request #34:
AIM log cleanup (https://github.com/floodlight/infra/pull/34)