* Add lambda benchmarks

* Remove lambda capture since the lambda is not at a block scope

* Remove LambdaBenchmark helper since FunctionBenchmark can be used with non-capturing lambas

* Add lambda benchmarks

* Remove lambda capture since the lambda is not at a block scope

* Remove LambdaBenchmark helper since FunctionBenchmark can be used with non-capturing lambas

* Add more docs for BENCHMARK_CAPTURE.

* Fix use of misnamed parameter

* Guard BENCHMARK_CAPTURE tests against non-c++11 compilers

* Move tests out of basic_test.cc