- Tests and benchmarks now only include the headers they really need.
- Warnings turned off for tests that compile with external boost libs that are not warning free
* InputIterator concept requires that the decrement of a postfix-incremented iterator is valid, now it is
* added detached_accessor to that end
* update benchmark plot, better docs
* fetching google benchmark with cmake
* use new thread-safe accumulator in histogram_parallel_filling
* update boost, root and gsl benchmarks to use google benchmark
* fixes broken msvc build
* smaller xml files for testing serialization
* fixing many warnings on msvc
* bug-fixes to mp_int regarding operators and new tests to check their behavior
* don't expect iterable histogram::at to have size method
* build benchmarks in release mode
* test everything by default when b2 is run on project directory
* more test coverage
* Travis uses b2 and codecov now
* replacing boost::multiprecision with custom implementation to avoid the dependency
* improved axis implementation: `update` is now a normal method
* introduced use_default tag type to set defaults
* whitespace fixes and doc update
