Update download.pod for v3.0, fix update_docs

Create output directory in update_docs if it doesn't exist
Remove docs/download.html from repository; auto generated
Update docs/download.pod for v3.0
Fix http links in some files
Change css to use em for consistency

Updates to css files for em spacing
Fix lib/http_server.pl to use html_style_print for
the error log.  html_style_error doesn't exist.
Remove remnants of aws_weather from mh.ini
Add warning if Insteon_PLM_serial_port is missing from ini file
Merge 'origin/fix_documentation' into running
Merge 'origin/fix_http_list_format' into running
Merge 'origin/fix_ini_cleanup' into running