Write unit tests

[aisouard]

This library needs unit tests for every classes :

• BinaryStream
• Crypto
• Crypto.Crc32
• DataSource
• DataSource.File
• DataSource.Http
• Listenable
• Manager
• Media
• Media.MP4
• Media.WebM
• Metadata
• MetadataSerializer
• MetadataUnserializer
• Peer
• PeerConnection
• Tracker.Client
• Tracker.Message
• Tracker.Server
• Utils

[aisouard]

Added Media.MP4 to the list.