Stop ignoring things that should be cleaned up

.gitignore

@@ -1,39 +1,12 @@
-bin/
-lm/bin/
-util/bin/
 util/file_piece.cc.gz
-lib/
-dist
 *.swp
 *.o
-query
-build_binary
-kenlm_max_order
-lm/left_test
-lm/model_test
-util/bit_packing_test
-util/file_piece_test
-util/joint_sort_test
-util/probing_hash_table_test
-util/read_compressed_test
-util/sorted_uniform_test
-previous.sh
-jam-files/bjam-1_55
-jam-files/engine/bin.*/
-jam-files/engine/bootstrap/
 doc/
+build/
 ._*
-include/
-prefix-include/
 windows/Win32
 windows/x64
 windows/*.user
 windows/*.sdf
 windows/*.opensdf
 windows/*.suo
-Makefile
-CTestTestfile.cmake
-cmake_install.cmake
-CMakeFiles
-CMakeCache.txt
-DartConfiguration.tcl