turn test/SharedMemory/test.c into a gtest for CI unit testing in github

remove overly verbose printfs in importers
fix axis in r2d2.urdf

Extras/Serialize/BulletFileLoader/bFile.cpp

@@ -644,7 +644,7 @@ void bFile::preSwap()
 				swap(dataPtrHead, dataChunk,ignoreEndianFlag);
 			} else
 			{
-				printf("unknown chunk\n");
+				//printf("unknown chunk\n");
 			}
 		}
 

Extras/Serialize/BulletFileLoader/btBulletFile.cpp

@@ -224,7 +224,7 @@ void btBulletFile::parseData()
 		//		}
 			} else
 			{
-				printf("unknown chunk\n");
+				//printf("unknown chunk\n");
 
 				mLibPointers.insert(dataChunk.oldPtr, (bStructHandle*)dataPtrHead);
 			}