added cuda lexer and removed example from c++ samples
checked in updated samples.json
Revert 94b3ea3..b301634

This rolls back to commit 94b3ea3df51edf6a7cfbd26016642e01844eb20e.
Merge remote-tracking branch 'upstream/master' into nvidia-cuda

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merged from master and updated samples.json
Merge pull request #758 from kashif/nvidia-cuda

added cuda lexer and removed example from c++ samples