Remove dependency of System.Runtime.Serialization.dll

Remove the references for DataContractAttribute and DataMemberAttribute
and re-implement with reflection-based attribute retrieving.

Signed-off-by: yfakariya <yfakariya@gmail.com>
Fix build issues related to PR #29.

Signed-off-by: yfakariya <yfakariya@gmail.com>
Add test for merging PR #30

Signed-off-by: yfakariya <yfakariya@gmail.com>
Fix issues related to application of PR29 to 0.5 branch.
Disable PR related test.
Delete removed project directories.
Remove project for Unity (it requires source tree instead of binary...)