This reverts commit 0a2bd8935391e42f2581ec4826f7ac5f8fc9041a.

This also points out some important issues like:
warning: conversion to 'size_t {aka unsigned int}' from 'long long int' may alter its value [-Wconversion]
   state.SetBytesProcessed(items_processed * sizeof(v));
This occurs on 32 bit systems where size_t is only 32 bits.

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