A rewrap case can need to transcode at specific moments:
* if there is an offset at the beginning
* if it continues with a generator at the end of the rewrap.

…ing case

Fix #165

Add properties of base class if the derived class override
getPropertiesAsVector (for Video and Audio).

Note: remove useless InputStreams clearBuffering call.

The streams analysis is done in the FileProperties, not in the
InputFile.

* It containes only references to the other properties (video,
audio...).
* Get the properties at the indicated stream index with only one
function.

Instead of the duration from the format.

Always need to create an InputFile to get the encofing profile from it,
but not necessary add it to our list of InputFile.

Because AudioGenerator inherits an IDecoder, we need to implement this
function and adapt it to the generator.

Fix input duration

…into dev_ManageOffsetOnRewrap

Conflicts:
	src/AvTranscoder/transcoder/StreamTranscoder.cpp

Manage offset on rewrap

If offset > duration of the stream, return a duration of 0.

…ration is exceeded

* positive / negative
* video/ audio
* transcoder / rewrap

Issue #92

* This need to be done after call of avformat_write_header.
* Add attribute _flags.
* Fix #92

From the GNU GCC man:

--coverage

This option is used to compile and link code instrumented for coverage
analysis. The option is a synonym for -fprofile-arcs -ftest-coverage
(when compiling) and -lgcov (when linking).

Not maintained.

* Add env variable for avtranscoder build directory.
* Add env variable for avtranscoder install directory.
* Fix capture of coverage in the avtranscoder install directory.

The pyTest were not launch for several commits, but Travis didn't raise
any errors...

Install & generate coverage in separate script files.

Use coveralls tool

Add presetdnxhd

Fix FormatContext private options

According to the ffmpeg documentation, priv_data of AVFormatContext is
"... an AVOptions-enabled struct if and only if
iformat/oformat.priv_class is not NULL."

* Install coverage tools even if Travis builds with clang ( because it's
easier to manage the command line to launch test, which uses coverage
nosetests plugin).
* Add CMake parameter to choose python version of the binding:
AVTRANSCODER_PYTHON_VERSION_OF_BINDING (Travis has updated its default python version to 3.2.3).