Added anim & thing metadata.
Animations read from meta.
Minor sky tiling fix.
Fixes for changes in rustc and sdl2.

* ```static``` changed to ```const``` as per this [RFC](https://github.com/rust-lang/meeting-minutes/blob/master/workweek-2014-08-18/static-and-const.md).
* ```move`` became a keyword so some renaming had to be done.
* bitflags moved from camel case to uppercase letters in sdl2.