Updated error handling, crate-type and .gitignore

[Ogeon]

• Error handling for IO functions are now using Result with error messages.
• Results from write() and flush() in std::io::Writer are handled.
• --lib has been changed to --crate-type=lib.
• .rlib-files are now ignored by git.

[metajack]

It appears that the only new commits here are f829107 and 3711bc3. Can you remove the others and just leave these two?

You can do this with interactive rebase and just removing all the commits except those two.

[Ogeon]

Yes, I'm sorry about the messy commits. I will fix them soon.

[Ogeon]

It should be fixed now. I made a mistake while rebasing before and accidentally included my own duplicates. I hope the rest is ok.

[metajack]

r+

[metajack]

Thanks for the help!