changed surfFeaturesFinder::find() to allow CV_8UC1 type images 

http://code.opencv.org/issues/2926
some typo
copying '.classpath' and '.project' to build dir, useful for opening in eclipse
test for the issue #2901
fix for #2901 (en exception was raised when getting empty MatOfDMatch)
Merge pull request #769 from apavlenko:fix_2901
Merge pull request #771 from gpsinghsandhu:surfFeatureFinder