- add comment on why we lowercase meta param
properly resized upload presentation window, removed unnecessary text
Merge pull request #371 from SenecaCDOT-BigBlueButton/upload-presentation-window-miscs

Properly resized upload presentation window, removed unnecessary text
added record icon to the recording notification
Added example of moderator-only welcome message
text changes to bbb-conf and index.html
Updated default PDF with text on each blank page
Minor updates to prompts
Merge pull request #372 from SenecaCDOT-BigBlueButton/record-reminder-icon

added record icon to the recording notification
Rewrite audio processing to use ffmpeg

There's some fairly major changes here, including:

* All audio is resampled to 48kHz stereo on input, allowing files with
  non-standard or varying rates to be mixed
* The audio processing is now done in a single pass; ffmpeg reads all
  inputs, concatenates them, and outputs one file.
Merge pull request #373 from kepstin/recording-updates

Rewrite audio processing to use ffmpeg
Use the correct timestamp for file start seek
Merge pull request #374 from kepstin/recording-updates

Use the correct timestamp for file start seek
 - prevent multiple start/stop audio recording events
Merge branch 'master' of github.com:bigbluebutton/bigbluebutton
Vorbis needs more bitrate for input with higher sample rate/stereo
Merge pull request #375 from kepstin/recording-updates

Vorbis needs more bitrate for input with higher sample rate/stereo
Don't use the ffmpeg concat filter when only one audio segment

The concat filter requires at least 2 segments, it doesn't support
the degenerate case.
Explicitly use out0 in degenerate concat branch.

There is no i variable here, since there aren't multiple inputs to loop
over.
Merge pull request #376 from kepstin/recording-updates-merge

Recording updates merge