Fix video duration and time remaining info.

omxplayer does not print out the duration of the video when
playing normally, so this commit makes a shell script wrapper
to actually run omxplayer twice.  The first time omxplayer
runs with the "-i" option to get the Duration and the second
time it plays the video normally.

Fixes #62.
Merge branch 'stage' of github.com:FalconChristmas/fpp into stage