Added attribute/spatial filtering methods to layers.
Merge branch 'refs/heads/master' into 0.2.x
Added --build-from-source to instructions on shared gdal use.
Added support for GPX files (#60).
Merge branch 'refs/heads/gpx' into 0.2.x

* refs/heads/gpx:
  Added support for GPX files (#60).
  Trigger appveyor.
  Fix segfault when Feature destructor decrements reference counter to 0. Reproduced by: defn = new FeatureDefn(); feature = new Feature(defn); feature = null; gc(); feature = new Feature(defn);
  Disable --trace-gc.
  Added forced GC after each test.
Added most default OGR formats.
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Added envelope.toPolygon() method.
Merge pull request #62 from naturalatlas/more-ogr-formats

Added almost all of the default OGR formats.
Added band pixel access. (#56)
Added pixels.readBlock(), pixels.writeBlock(). (#56)
Also added support for reading into existing arrays.
Starting writing RasterBand tests.
Added obj creation/destruction logging.
Only remove objects from cache when they are destroyed (not in ObjCache.WeakCallback).
Fixed unsafe TOSTR() usage.
Merge branch 'gc-testing' into pixel-access
Added pixel access tests. (#56)
Also improved array length validation.
Fixed compile error / warning.
Enable GC logging on Appveyor (push output as artifact for debugging) #59
Fix for artifacts not being published if test fails.
Simplified pixel read/write arguments (#56).
Typo in docs.
Clarified read "type" option