- Workaround for Collada exporter in SketchUp 15.3.331 (possibly others) where it'll export the wrong "count" when exporting "lines".
	- When I encounter this condition I just print a warning and use the actual number of points in the file instead of the number they give, as opposed to throwing an exception and bailing on the whole file.
	- For an example of this kind of file see https://3dwarehouse.sketchup.com/warehouse/getpubliccontent?contentId=e4587719-2609-49ed-a2f6-20b98d1215f3&fn=Kartell-GE.zip
	- Some people have complained about this on http://forums.sketchup.com/t/bug-in-lines-exported-at-collada-format/8145

	- Sure, it'd be better if this code were clean, but these warnings
ONLY appear when we build for the simulator, NOT for iOS or OS X for
real, so f' em.

- Added a generic renderToImage() function to SCNRenderer, so we can share with StackOverflow / Goossens.

Someone who speaks C++ should maybe go back through and see if these
warning are really relevant!

I'm trying to merge in changes from the main project.

- Bugfix: IfcLoader lost nodes and geometry when they were stored in subnodes of IfcSpace and the setting "Filter IfcSpace" was enabled

- This may not appeal to everyone, but I wanted a simple static library
Project I could include in a Xcode Workspace that would auto-build when
I built an iOS or OS X app.
- If you drag this project file into your Workspace and then add the
libassimp.x.x.a file as a dependency in your project inspector, it
should auto-build in the architecture of your choice.

Added 'const' to () operator on CompareVector

So it can build on clang.

Adds safety and prevents crashes for damaged files

Fix read past end of buffer after call to TokenMatch

IsSpaceOrNewLine returns true on end of input (NUL character). But if
TokenMatch considers a token at end of input to match it sets "in" to
one past end of buffer. This will lead to reading past the end of
buffer on any subsequent operation.

Use material names, set default direction to UP_Y, process extra tag

Free edges map before recursive calls to reduce memory consumption

addition to c4997f16 (#476)

(thanks turol)

- reintroduced IFC openings to floors and ceilings. Were disabled for some unknown reasons, I hope I didn't break anything. Everything I tested works fine.

- Bugfix: closing polygon loop along boundary polygon now correctly projects boundary vertices to polygon plane

remove "register" keyword:

clang warns: 'register' storage class specifier is deprecated
http://stackoverflow.com/questions/10675072/is-the-register-keyword-still-used

Clean up some warnings

Update IfcLoader to use numeric_limits<uint32_t> instead of UINT32_MAX, ...

Update IfcLoader to use numeric_limits<uint32_t> instead of UINT32_MAX, fixes gcc build and is more consistent with the rest of the codebase. Fixes #471.