Fixed english mistake into the README.md file.
Update README.md
Correct some typos in README.md
Small grammar fix
Merge pull request #147 from gianpaj/patch-1

Correct some typos in README.md
Merge pull request #146 from SeyZ/patch-1

Fixed english mistake into the README.md file.
Fix typo in mongokit/collection.py
Fix typo in mongokit/auth.py
Fix typos in mongokit/document.py
Fix typo in mongokit/grid.py
Fix typos in mongokit/helpers.py
Fix typo in mongokit/migration.py
Fix typos in mongokit/schema_document.py
Fix typo on mongokit/versioned_document.py
Fix typo in doc/document.txt
Fix typos in doc/gridfs.txt
Fix typos in doc/i18n.txt
Fix typo in doc/index.txt
Fix typos in doc/internal_structure.txt
Fix typos in doc/migration.txt