closes#465
This script generated gradle-maven-blocks.yaml:
```python
import os
import re
import yaml
pat = re.compile(r'\smaven\s*{[^}]+}')
finds = set()
for root, dirs, files in os.walk('.'):
for f in files:
if '.gradle' in f:
with open(os.path.join(root, f), errors='surrogateescape') as fp:
contents = fp.read()
for m in pat.findall(contents):
finds.add(m)
with open('finds.yaml', 'w') as fp:
yaml.dump(sorted(finds), fp, default_flow_style=False)
```
