Split the types and attributes reference doc into two docs

Also moved them up in the index so that the more fundamental material
comes before the more advanced material in the table of contents.
Add more script language reference documentation

Added new sections on operators, statements, and directives.  Also
improved the documentation on types and attributes by providing more
examples and added a chart on the top of each page with links to
each type and attribute for easier access to the information.
Merge remote-tracking branch 'origin/master' into topic/dnthayer/langref
New page for List of Log files, linked to script-reference
Changing name of file
More updates to log files page: descriptions
Adding deatils for modbus_register_change.log
Broke down logs into grouped sections based on use & origin
Add a test that detects changes in the list of all Bro log files
Added missing log files prof, stderr, stdout
Improved the log file reference documentation

Reorganized the log file reference documentation, improved some of the
descriptions, and corrected a typo in a log filename.  Also removed
non-ascii characters that somehow got in the text.
Fix regression causing the main loop to spin more frequently.

Addresses BIT-1266.
Fix packet sources being treated as idle when a packet is available.

Addresses BIT-1266.
Merge remote-tracking branch 'origin/topic/jsiwek/pktsrc-idle'

* origin/topic/jsiwek/pktsrc-idle:
  Fix packet sources being treated as idle when a packet is available.

BIT-1266 #closed

Thanks, Jon!
Updating plugin docs.

The remaining components are now supported as well.
Fix uninitialized router_list argument in dhcp_offer/dhcp_ack.

BIT-1268 #close
Improves shockwave flash file signatures.

 - This moves the signatures out of the libmagic imported signatures
   and into our own general.sig.

 - Expand the detection to LZMA compressed flash files.
Minor improvements to script language reference docs
Merge remote-tracking branch 'origin/master' into topic/dnthayer/langref
Merge remote-tracking branch 'origin/topic/dnthayer/langref'

* origin/topic/dnthayer/langref:
  Minor improvements to script language reference docs
  Add more script language reference documentation
  Split the types and attributes reference doc into two docs

Wow, this is great!

BIT-1269 #merged