Unary minus where applied to an unsigned type.

Fix issue #141. Use size_t instead of int for the iteration count

Remove std::is_trivially_destructible assertion. Fix issue #134.

Updates Initialize() to work with an argv as 'char**'

Jleroy/vs2013 compatibility

Fix documentation comment in benchmark_api.h w.r.t CustomArguments

Fix doc sample typos in header and README

* iterations() is a method
* int64_t fix in a couple of places

Fix the compilation error against G++ on Mac OS X.

Using `0` as a null pointer is illegal when `-Wzero-as-null-pointer-constant`
is given to G++.  To avoid the warning `zero-as-null-pointer-constant`,
`nullptr` (C++11 keyword) instead of `0` is used in the `sysctl` invocation.

Fix issue #127

Fixing cmake issue with empty cmake_build_type

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