Better gitignore
Better gitignore

- Ignore build directories in nested samples
- Include changes to checked-in IDEA config

blindpirate/gradle,blindpirate/gradle,robinverduijn/gradle,blindpirate/gradle,blindpirate/gradle,robinverduijn/gradle,gradle/gradle,gradle/gradle,robinverduijn/gradle,blindpirate/gradle,robinverduijn/gradle,robinverduijn/gradle,gradle/gradle,gradle/gradle,blindpirate/gradle,robinverduijn/gradle,gradle/gradle,gradle/gradle,blindpirate/gradle,blindpirate/gradle,robinverduijn/gradle,gradle/gradle,blindpirate/gradle,robinverduijn/gradle,robinverduijn/gradle,gradle/gradle,robinverduijn/gradle,gradle/gradle,robinverduijn/gradle,blindpirate/gradle,gradle/gradle