Log Message:
Update grantlee to 0.5.1

- Version 0.5.1 --
-------------------
* Make the coverage target work with Qt 5.
* Make the examples build with Qt 5.
* Drop the Qt 5 requirement to 5.2.0 from 5.3.0.
* Don't unload plugins when no longer used.

-- Version 0.5.0 --
-------------------
* Bump Grantlee CMake requirement to 2.8.11.
* Fix parsing of filter expressions in the extends tag.
* Export CMake targets for grantlee plugins.
* Add a way to build Grantlee with Qt 5.

-- Version 0.4.0 --
-------------------
* Bump Grantlee CMake requirement to 2.8.9.
* Use the CMAKE_AUTOMOC feature in Grantlee.
* Clean up all CMake code.
* Fix memory leak when deleting a localized template loader.
* Clean up C++ code in preparation for Qt 5.
* Update jQuery version used in example to the latest release.
* Add API for resolving variables to strings in QtScript.
* Fix tests on ARM and other platforms which use float for qreal.