Correct writing error
Merge pull request #3 from shoyu63/master

Bug correction
Add __enter__ and __exit__ methods to enable with-statement
Add gitignore with compiled files
Merge pull request #4 from pswaminathan/master

Add __enter__ and __exit__ methods to enable with-statement
Update README.rst
Merge pull request #6 from and34/master

Update README.rst
use mutable warning from shelve's docs
Merge pull request #2 from piskvorky/master

latest from upstream