Improve gitignore.

.gitignore

diff --git a/.gitignore b/.gitignore
index 5805b34..cbe3c57 100644
--- a/.gitignore
+++ b/.gitignore
@@ -10,4 +10,18 @@
 *.a
 *.so
 *.so.*
-run_tests
+/run_tests
+Makefile
+CMakeLists.txt.user
+CMakeCache.txt
+CMakeFiles
+CMakeScripts
+Testing
+cmake_install.cmake
+install_manifest.txt
+compile_commands.json
+CTestTestfile.cmake
+_deps
+*.cmake
+*.kdev4
+DartConfiguration.tcl