Add a global .gitignore file now we're all using git

.gitignore

@@ -0,0 +1,12 @@
+# git-ls-files --others --exclude-from=.git/info/exclude
+# Lines that start with '#' are comments.
+# For a project mostly in C, the following would be a good set of
+# exclude patterns (uncomment them if you want to use them):
+# *.[oa]
+# *~
+
+# /
+/build
+/dist
+/nbproject/private
+/plugins