Update tiled_it.ts
Cleaned up some strange MapObjectModel code

The MapDocument pointer of the model should not be changed. The model
is owned by the MapDocument after all. Also, there was no need for
the additional (and uninitialized) mMapObjectModel member.

Coverity-issue: 1165682 (Uninitialized pointer field)
Added support for moving image layers in the Properties window
Flare plugin: Removed unneeded null pointer check

Coverity-issue: 1165680 (Dereference before null check)
Lua plugin: Removed conversion from tile to pixel coordinates

This is no longer necessary since the units are already in pixel
coordinates.

Closes #611
Update tiled_it.ts

Removed "unfinished" tag from translated strings, and translated some others.
Merge pull request #588 from Omnomnobot/patch-3

Italian translation updates
Added read-only tile ID property to Properties window

Displays the local tile ID of a tile, which can be useful in some cases.

Closes #15
Avoid wrong removal of objects when resizing the map

Since object coordinates are now in pixel coordinates, the visibility
check of the resize operation was wrongly determining most objects were
outside of the map boundaries and removed those objects. Now it should
correctly take the pixel coordinates into account. At the same time,
handling of tile objects and object rotation was added.

While working on this I found another bug however, which is that the
object positions are not adjusted correctly. This is because the
correction is still applied in tile coordinates.

Closes #617
Fixed position adjustment of objects when resizing map

The same issue still affects the "Offset Map" action, though.
Renamed resizelayer.cpp/h to match new class name
Fixed "Offset Map" action to offset objects properly

Objects were still getting offset in tile coordinates even though their
position and size are now in pixel coordinates.
Added a USE_FHS_PLUGIN_PATH switch

Setting this variable during the qmake run will make tiled
correctly picking up the install dir of plugins if the
lib path differs from "../lib" (generally the case for 64 bit releases).
Merge pull request #621 from Ablu/64bit_plugins

Added a USE_FHS_PLUGIN_PATH switch
Make travis run the tests
Merge pull request #622 from Ablu/travis_tests

Make travis run the tests
Removed unused include

Found by Ablu. ;)
Removed unused rename icon
Avoid hang on Mac OS X when drawing certain ellipse objects

Trying to draw an ellipse with 0-width is causing a hang in
CoreGraphics when drawing the path requested by the
QCoreGraphicsPaintEngine. Draw them as rectangle instead.

In the isometric renderer, a rectangle is drawn as well anyway,
so the drawing of a 0-width ellipse is simply avoided.

Fixes #613