Use unescape for paths before reading files

[RST-J]

This re-fixes #100 (it was fixed until the last commit in #174 introduced convert_path).

[hoxworth]

👍

[iainbeeston]

Would it be easy to add a test for that so it doesn't break again?

Otherwise this looks good to merge.

[RST-J]

I'll have a look at it.

[RST-J]

I found a spot where we didn't use convert_path yet. Because of this, the tests in test/test_uri_related.rb that have the ref schema path with spaces didn't fail.
I one removes unescape in custom_open now, these will also fail in a checkout directory that does not contain spaces.
If that still not suffices we have to come up with a test that passes in a file name with spaces directly.

[iainbeeston]

If you think it's not too hard to replicate, then I think it'd be good to add a test for it, but if it's hard, then don't bother (and merge this!)

[iainbeeston]

The again, the build is failing

[RST-J]

Strange, on my machine, using Ruby 2.0.0, the tests all pass.

[RST-J]

Now it worked without that I've changed anything with respect to the previously failing test. Strange, maybe execution order plays a role here.