upgrade .net core support to 1.0#76

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kerryjiang wants to merge 3 commits intotoptensoftware:masterfrom

kerryjiang:master

Commits on Apr 26, 2016

downgraded to the target netstandard1.1 to support more platforms
kerryjiang
committed

Commits on May 21, 2016

adjusted the project file for .net core rc2 release
kerryjiang
committed

Commits on Jul 1, 2016

upgraded to .net core 1.0
kerryjiang
committed