Merge pull request #12 from uBLAS/develop

Develop
Merge pull request #13 from uBLAS/develop

merged ublas:develop into boostorg:develop
Fix link to documentation.

The last release broke the link. The default works fine, so use that instead.
Merge pull request #16 from danieljames/develop

Fix metadata link to documentation.
Merge remote-tracking branch 'ublas_upstream/develop' into develop