Go testing frameworks

Demonstrates the use of different testing frameworks for Go code.

Go File	Framework	Description
calc_standard_test.go	testing package	Go standard library testing support
calc_testify_test.go	Testify	Assertion and mock helpers
calc_gocheck_test.go	gocheck	Assertion helpers
calc_gopwt_test.go	gopwt	Power assertion helpers
calc_gotestdeep_test.go	go-testdeep	Deep comparison helpers
calc_ginkgo_test.go	Ginkgo	Heavyweight BDD testing framework + assertion helpers
calc_goblin_test.go	Goblin	A Mocha like BDD testing framework
calc_goconvey_test.go	GoConvey	BDD testing framework with web UI