Clean up gitignore and add secrets.json

.gitignore

@@ -1,9 +1,23 @@
-bower_components
+# System Cruft
+# ================================================
 .DS_Store
 *.swp
 *.swo
+
+# secret stuff
+# ================================================
+secrets.json
+
+# Generated stuff
+# ================================================
+build
 node_modules
 contracts/Standard_Token/config/development/contracts.json
 contracts/Standard_Token/config/test/contracts.json
 contracts/Standard_Token_Factory/config/development/contracts.json
 contracts/Standard_Token_Factory/config/test/contracts.json
+
+
+# Other
+# ================================================
+bower_components