Merge pull request #4 from roysc/master

fix call to directory-file-name(nil) when cmake-project-build-directory ...
fix: if cmake-project-build-directory is existing, use that instead of resetting it
This allows to use e.g. dir-locals for configuring the binary dir
Merge pull request #5 from hrehfeld/master

fix: if cmake-project-build-directory is existing, use that instead of r...
Update to version 0.7 for Marmalade