Reduce dependencies and build for NET45 also
Reduce dependencies and build for NET45 also

alexperovich/corefxlab,ericstj/corefxlab,Vedin/corefxlab,Vedin/corefxlab,Vedin/corefxlab,ahsonkhan/corefxlab,stephentoub/corefxlab,stephentoub/corefxlab,stephentoub/corefxlab,tarekgh/corefxlab,benaadams/corefxlab,hanblee/corefxlab,ericstj/corefxlab,Vedin/corefxlab,ericstj/corefxlab,VSadov/corefxlab,VSadov/corefxlab,ericstj/corefxlab,dotnet/corefxlab,VSadov/corefxlab,adamsitnik/corefxlab,whoisj/corefxlab,Vedin/corefxlab,stephentoub/corefxlab,ericstj/corefxlab,benaadams/corefxlab,whoisj/corefxlab,stephentoub/corefxlab,VSadov/corefxlab,ericstj/corefxlab,VSadov/corefxlab,joshfree/corefxlab,KrzysztofCwalina/corefxlab,adamsitnik/corefxlab,stephentoub/corefxlab,ahsonkhan/corefxlab,Vedin/corefxlab,VSadov/corefxlab,KrzysztofCwalina/corefxlab,hanblee/corefxlab,tarekgh/corefxlab,dotnet/corefxlab,joshfree/corefxlab