remove old (brute force) method for measuring gzip uncompressed size

git-svn-id: https://fable.svn.sourceforge.net/svnroot/fable/fabio/trunk@5409 d066a591-ed20-0410-833c-cb8bbb91b4a7
Testcase for a bug I encounter when the filename is "merged.azim" ...
bugfix for this issue:
https://github.com/kif/fabio/issues/1
Merge remote branch 'origin/master'