FLVMeta 1.2.0

• Added dumping of AVC and AAC packet information.
• Added unit tests to the continuous integration system.
• Switched to Semver 2.0 as versioning scheme.
• Improved 64-bit and file handling compatibility.
• Improved FLV file checking.
• Removed support for the autotools build system.
• Fixed timestamp distance computation in check.
• Fixed installation instructions for CMake.
• Fixed JSON output of non-finite numbers.
• Fixed number printing.