prepare.sh: .gitignore shouldn't be included in npm package. closes #178

Author: olov

build/prepare.sh

@@ -9,6 +9,8 @@ cd ng-annotate/build
 ./build.sh
 # delete build scripts
 rm *.sh *.js defs-config.json ng-annotate
+# delete .gitignore
+rm ../.gitignore
 # delete large test artifacts
 rm ../tests/angular.js ../build/es5/tests/angular.js
 cd ../..