Fix uncompress issue and stream

[remicollet]

1st commit

• handle error in xzdecode (bad XZ data) with test

2nd commit

• fix buffer management in stream
• add test to ensure stream are working (on some big file)
• add context options for level and memory (see test for example)

[codemasher]

Thank you! I wonder if someone can adopt it for PECL, like proposed in the internals tread linked in the readme?

[remicollet]

What about tagging a 1.1.2 ?

[codemasher]

As soon as i got the CI for Windows running - i'd like to include the .dll in the release without having to compile them on my own PC :)

[codemasher]

Sorry for the delay - I've tagged 1.1.2 now. I haven't found time and nerves yet to include automated windows builds.