Uninstall target implementation has hard coded module paths

[tfoote]

"""
configure_file(
"${CMAKE_SOURCE_DIR}/Modules/UninstallTarget.cmake.in"
"${CMAKE_CURRENT_BINARY_DIR}/UninstallTarget.cmake"
IMMEDIATE @only)
""""
These lines mean that I cannot include this package as a subdir of a larger CMake build, for it now looks at a higher level.

[qdot]

We should be able to change CMAKE_SOURCE_DIR to CMAKE_CURRENT_SOURCE_DIR and have this work, correct?

[qdot]

Also, if you're going to try implementing this in a larger repo, i'm seeing things in examples and lib CMakeLists.txt that may give you problems. We'll probably need to move the INCLUDE_DIRECTORIES calls up to the root and use CMAKE_CURRENT_SOURCE_DIR on those.

[tfoote]

CMAKE_CURRENT_SOURCE_DIR works. I'm closing this and I'll open a separate pull request. For reference sha: ca531ee I've opened a pull request now #46