Merge pull request #33 from kyoushuu/master

camelCase -> lower_case fixes
player: set uri correctly
widgets: correctly format titles
widgets: iter_next returns iter, not sets it
player: set default playing
player: add timeouts correctly
player: add parameter to _onProgressValueChanged

Fixes #25 and #24
player: fix repeat mode setting
player: set sensitivity of prev/next button
player: set image for playbutton correctly
player: sensitive -> get/set_sensitive
player: correct params for _onProgressScaleEvent
player: corect params for onProgressScaleButtonReleased
player: don't set priority in timeout_add
widgets: correctly hide columns
player: correctly check for previous track to exist
player: don't set play button image when its not needed
player: correctly set next/previous track
player: correct params for query_duration
player: correctly verify for playing state