Added some tests for Grid.
Commented several tests in TestGrid.cpp.
Replaced hardcoded boost libs with CMake variables.
Shared boost libraries are now searched for by default.

To search for static boost libs configure with Boost_USE_STATIC_LIBS=ON
from the command line or as a parameter to ccmake.
One more fix for automatic boost build when boost was not found.
Boost_LIBRARIES is also not cached by FindBoost.cmake.
Merge pull request #126 from bilke/BoostFix

Replaced hardcoded boost libs with CMake variables.
This enables linking against shared libraries.
Merge pull request #118 from TomFischer/TestGrid

Added some tests for the class template Grid.