Release 0.3.2
Merge branch '0.4'
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Update API documentation related notes.
Fix and improve usage (issue #19)

(cherry picked from commit a6558fa1ce0b12c8bb94e01a967d0aff68f29e9a)
Fix synchronization issue of MessagePackSerializer.Create (issue #20)

(cherry picked from commit 9bedf6c4b32e2dabb446557019ed25328d00ae19)