using stream.getBytes, to avoid content truncation

Fixes #136
Previously only the first 100K bytes where read from documents in rdl.
By using stream.getBytes instead of the homemade byte-reader we get the
whole document, even if it's the BrB..

Added a somewhat lousy test to make sure the document isn't truncated.
Merge branch 'develop' of github.com:rinfo/lagrummet.se into develop