Update fcrepo-build-tools version to match other projects

Resolves: https://www.pivotaltracker.com/story/show/72657116
Fixed the NPE bug to support the SPARQL str function, and throw NotImplementedException for comparing subject variable value.
Merge pull request #408 from lsitu/feature/sparql_function

Fixed the NPE bug to support the SPARQL str function, and throw NotImplementedException for comparing subject variable value