Workaround for long time to build many AssetBundles.

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At Unity 5.5 , the build time of AssetBundle is increasing exponentially by the number of AssetBundle.

Graph1.releation between the number of AssetBundles and building time

Issue Tracker:
https://issuetracker.unity3d.com/issues/drastically-longer-asset-bundle-building-time-when-building-multiple-small-asset-bundles
(This issue was fixed at Unity 5.5.3p2/5.6.0p2)

This is a workaround project.

To make the build time shorter, it is effective way to separate calling "BuildPipeline.BuildAssetBundles".

Graph2.this workaround

1). Import the "SeparatedAssetBundleBuild.unitypackage".
2). Replace "BuildPipeline.BuildAssetBundles" to "UTJ.SeparatedAssetBundleBuild.BuildAssetBundles".
*Single manifest file will be the last build's one.

We prepared test case.
Call "Sample/SampleWindow" from menu.

1)The number of datas.
2).Create test datas.
3).Build assetBundle without this workaround.
4).Build assetBundle with this workaround.