Tab expansion for hook/cb commands
New option
    follow (false)
            If enabled, always select the currently playing track on track change.
New bind
    bind common f toggle follow
New flag in status bar
    F
fix docs
vorbis: recognize .oga and .ogx file extensions

Signed-off-by: Gregory Petrosyan <gregory.petrosyan@gmail.com>
remove trailing whitespace
Merge pull request #60 from mahkoh/whitespace

remove trailing whitespace
Merge pull request #56 from mahkoh/follow

Follow track on track change.
Add Travis-CI configuration file

Signed-off-by: Gregory Petrosyan <gregory.petrosyan@gmail.com>
Add Travis-CI badge to the README.md

Signed-off-by: Gregory Petrosyan <gregory.petrosyan@gmail.com>
Merge remote-tracking branch 'upstream/master'