Add null-ckeck analyzer and code fix#43

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s-arash wants to merge 3 commits intoDustinCampbell:masterfrom

Commits on May 10, 2016

Add null-ckeck analyzer and code fix
s-arash
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Commits on May 17, 2016

Override GetFixAllProvier() in NullCheckToNullConditionalCodeFix to support batch fixing
s-arash
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Commits on Jun 7, 2016

Remove the unnecessary dependency on Microsoft.VisualStudio.QualityTools.UnitTestFramework that somehow snuck in.
s-arash
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