* Creation of a feature to concatenate files into a new one.
* Update of the README
* Creation of the tests for the concatenation
* We use an array of videos instead of a path to a text files
* We use the bundle Temporary File System instead of getcwd
* Modification of the format Video to add additional parameters based on user's desire
* Update of the README
* Working version of this feature. Still needs tests
* Fixing the tests of FFMPeg\Media\Video
* Setting up tests for the additionalParams feature
* Correction des tests
* Modifying tests. They work locally but not on Travis.
* Still trying to understand why Travis is throwing errors when PHPUnit is not.
* Add the additional params at the end of the command
* Fixed the tests and the way we add the parameters
* We remove log files
* Creation of a media to extract video sequences into gif files
* We add a gif method to the class Video to be able to use the Gif Media.
* Parameters where missing in the declaration of the gif function
* One parameter was badly defined in the gif method
* We use the proper media in the method gif
* We add a missing declaration in the Video class
* Update of the README file
* Modification of the README file
* We remove an empty class
