+ Added objects to the isometric (staggered) renderer
* Fixed bug that caused grey artifacts at the top left and right corners of a tall sprite when in isometric (staggered) renderer
Allow changing order of open document tabs
Match open document order with document tab order
Changed coding style to match the original
Change DocumentManager to use MovableTabWidget
Removed a non-functional hack that was causing a crash

This code was meant to make sure positions and sizes of objects stored
as part of tile collision information were in coordinates relative to
the tile texture, ranging from 0-1. However, it is no longer functional
since the map's tile width and height are no longer used by the map
reader and writer now that the objects store their positions in pixels
rather than tiles.

Overall I think it's anyway a better idea when the positions and sizes
are kept in pixels here and not stored in "texture coordinates", since
this is consistent with the units used in regular object groups. In
addition it is trivial to divide the values by the size of the tile to
obtain the texture coordinates.

Fixes #646
Fixed mapreader test

Object position and size are now stored in pixel instead of tile units.
Fixed staggeredrenderer test

Pixel coordinates were renamed to screen coordinates.
TileTool StatusInfo: Added Tile ID

Show tile id in the status bar
Normalize MovableTabWidget signals and slots
Fix: "Tile ID" does not showing in status bar
Removed use of deprecated functions from qtpropertybrowser
Removed usage of deprecated qVariantValue
Initial support for compiling Tiled with Qbs

Not compiling additional binaries or any plugins yet, and not taking
care of the translations. Install step not tested either.
Fixed unused variable warning when compiling in Release mode
Added parenthesis suggested by gcc

No difference in behavior, but good for clarity.

warning: suggest parentheses around comparison in operand of ‘^’
[-Wparentheses]
Removed line that is causing a warning when read by Qt Creator

"Cannot read /home/bjorn/projects/tiled/src/qtpropertybrowser/config.pri:
No such file or directory"

Tiled is not going to use the QtPropertyBrowser as a library anyway.
Fixed missing translation update
Merge pull request #652 from Champi080/master

TileTool StatusInfo: Added Tile ID
Some simplifications and fixes to showing local tile ID

* Removed separate updating function and data member
* Use TileLayer::contains instead of TileLayer::bounds().contains()
* Don't show 0 as "None" since for the local tile ID, 0 means the first
  tile in the tileset
* Tweaked notation a little
* Removed unnecessary isEmpty and isTileLayer checks
* Removed the isVisible check, since I think it is a little confusing to
  display "None" just because the layer isn't visible
* Made sure the text is translatable, and renamed "None" to "empty"