Update to 2.7.1

Changelog:
Version 2.7.1 <2014-03-07>
--------------------------

  * fixed title selection menu
  * fixed burning from command line
  * updated ffmpeg to version 2.1.4

Version 2.7 <2014-02-20>
------------------------

  * better support of multiple titlesets
  * added a possibility to add a chapter selection menu
  * added the rectangle selection tool
  * added possibility to align multiple buttons to left/right/top/bottom
  * added slide properties dialog
  * added a possibility to select a titleset to import from DVD
  * changed to use mplex tool for menu multiplexing
  * updated ffmpeg to version 2.1.3

Version 2.6.1 <2013-11-29>
------------------------

  * fixed device enumeration on Windows
  * updated some translations
  * updated ffmpeg to version 2.1.1

Version 2.6 <2013-11-13>
------------------------

  * added slideshow transitions
  * loop slideshow audio
  * added support of ffmpeg audio filters (see https://ffmpeg.org/ffmpeg-filters.html)
  * added possibility to specify output directory
  * added command line options "temp", "iso" and "device"
  * added displaying of progress by loading files
  * added printing of the title size information in log
  * fixed handling of unicode filenames on Windows
  * fixed upmix to 5.1
  * fixed calculation of borders for keeping aspect ratio
  * updated ffmpeg to version 2.0.1

Version 2.5.2 <2013-08-18>
--------------------------

  * added log file
  * fixed loading of project with video buttons

Version 2.5.1 <2013-08-02>
--------------------------

  * updated ffmpeg to version 2.0

Version 2.5 <2013-07-12>
------------------------

  * redesigned chapters and cell properties dialogs
  * added frame spin controls
  * added disc capacity "CD 700MB"
  * added possibility to justify text left/right
  * added support of video files without audio streams
  * added support of SMPTE time codes in chapter list
  * added possibility to set "default chapter length" to 0 to disable creation of chapters
  * fixed rendering of video buttons
  * fixed displaying of start and recording time
  * updated ffmpeg to version 1.2
  * added Spanish (Argentina) translation (thanks to Eduardo Quinteros)
  * added Hungarian translation of DVDStyler Guide (thanks to G畸or Demecs)

(ryoon)