Add new nether render mode.
Added name to CONTRIBUTORS.rst
add some initial work on region trimmer
Added Entities support
remove unused import
fix node deletion, better usage message
inital commit to utilize the travis-ci
Fix the readme to show travis icon
dumb commit to trigger travis
travis: removed notifications and whitelist
Merge pull request #823 from overviewer/travis

Travis
added python 2.6 to travis and link to readme
told travis about 3.2
removed python 3 from travis
Merge pull request #824 from overviewer/travis

Travis-Python2.6
Update overviewer_core/src/iterate.c

Support id > 255 for check_adjacent_blocks
Added direct link to the Windows Tutorial

THis is displayed when the user double-clicks overviewer.exe on Windows
Add wooden button, command block, beacon block and cobblestone (and mossy) wall.
Update trapdoors, now they have top and bottom version.
removed note about install, caused more grief than good