Fix prev button while in gapless mode.  All buttons tested and working.
fix eyezm authentication issue
rework prev and next buttons
modify play button
Modify window size to exclude task bar area
Dockerfile works properly, documentation updated

- Dockerfile now builds properly
- Dockerfile now ADDs files from local directory. This allows
  you to either pull from github (for master) or to build
  locally (for development)
- Removes some dependencies from container (wget, git)
- Removes pulling apache virtual host file from github
- Upgrades MySQL start check to actually check instead of just
  sleeping
Support streaming with zms (using ffmpeg) better
    * ZoneMinder compiles with ffmpeg 0.5..master
    * Make VideoStream class able to stream through ffmpeg better.
    * Ability to use fixed quality instead of fixed bitrate (by specifying bitrate 0...100)
    * Format url parameter supports <format>/<encoder> syntax

Details:
    - Redefine av_err2str to a to avoid compiler warning on newer g++'s
    - When using rtp format; if ffmpeg does not have a default codec, use CODEC_ID_MPEG4. (because this is what the default is as of 2.2 when this code was written)
    - Specify ofc->packet_size if rtp format is requested
    - Video generated in a thread to guarantee a constant fps.
    - Move _AVCODECID definition into zm_ffmpeg.h (and use instead of (AV)CodecID
    - Call avformat_network_init because ffmpeg warns about it beeing required soon.
    - increase VideoStream::video_outbuf_size to 4MiB to be able to encode larger pictures
A variable was referenced as a pointer when it was not.
- Removed an unreferenced variable
- fixed compilation issue with sws_..isSupported when compiling with ffmpeg 0.5
- use _AVCODECID_NONE instead of CODEC_ID_NONE
focus popup windows
- render video using double buffers
this is to deliver frames more accurately to the client
- Arrays should be deleted using "delete[]" and not "delete"
add RTSP digest authentication
parse 401 response for RTP_RTSP_HTTP
add digest auth file for cmake
fix digest auth for RTSP using HTTP tunnel
make skin selection cookie persistent
make expiry date relative (~10years)
Changes to the Contribution section of the readme