Merge pull request stretchr#266 from ernesto-jimenez/golint

Fix golint warnings

Merge pull request stretchr#264 from stretchr/issue-263

Fix Backwards Incompatible change to TestingT

Merge pull request stretchr#262 from stretchr/issue-261

Add FailNow back

Merge pull request stretchr#241 from ernesto-jimenez/codegen

Autogenerate code for require and forwarded assertions

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