use .gitignore from pokecrystal

This is the .gitignore from commit 1c3ebf95 in the pokecrystal.git
repository.

.gitignore

@@ -0,0 +1,42 @@
+# precompiled python
+*.pyc
+
+# precompiled jython
+*$py.class
+
+# compiled object file
+*.o
+
+# no binaries
+*.exe
+
+# roms
+*.gbc
+*.gb
+
+# generated
+*.tx
+
+# swap files for vim
+.*.swp
+
+# swap files for gedit
+*~
+
+# no data from extras/
+extras/*.json
+
+# for any of the poor souls with save game files in their working directory
+baserom.sgm
+baserom.sav
+baserom.rtc
+pokecrystal.sgm
+pokecrystal.sav
+pokecrystal.rtc
+
+# for vim configuration
+# url: http://www.vim.org/scripts/script.php?script_id=441
+.lvimrc
+
+# some users are dumping png.py into extras/
+extras/png.py