Fixed #35.

* compilers.jam: Added support for `<std>c++1y` property.
* template/x86_64-unknown-linux-gnu/site-config.jam: Likewise.
* clang/jamfile: Likewise.
* boost/jamfile: Likewise.
* ppl/jamfile: Likewise.
* summary.sh: Likewise.
Merge branch 'master' into fix-35
Merge pull request #80 from Cryolite/fix-35

Fixed #35.