need sync sound because sound is stopped in destructor
when leaving scope which occurs before the sound is heard
when playing asyncronously
export newly added classes for windows linkage
Revert "need sync sound because sound is stopped in destructor"

This reverts commit 4982eae71c4c9fddae65d9f017c463e9acd1291b.
Merge pull request #66 from seandepagnier/master

new classes need DECL_EXP