Bug fixes
- Fix issue where `metadata_parser` would not consume spaces in string
metadata fields. Thanks to @hopsalot on the forum for the bug report!
- Fix build issue on OS X with Xcode 6.4 and `clang` related to their
shipped version of `string_view` lacking a const `to_string()` method
Enhancements
- The `./profile` executable ensures that the file exists before operating on
it. Thanks to @domarps for the PR!
- Add a generic `util::multiway_merge` algorithm for performing the
merge-step of an external memory merge sort.
- Build with the following Xcode versions on Travis CI:
* Xcode 6.1 and OS X 10.9 (as before)
* Xcode 6.4 and OS X 10.10 (new)
* Xcode 7.1.1 and OS X 10.10 (new)
* Xcode 7.2 and OS X 10.11 (new)