Fix data type conversion to avoid PHP warning.
Prevent string clean up for non string values.
Merge pull request #44 from sergeykalenyuk/improvement

Improvement
Fix PHP fatal error when use catalog product flat.
Merge pull request #45 from sergeykalenyuk/improvement

Fix PHP fatal error when use catalog product flat.
Remove store code prefix from object id because the store code is added to the index name.
Merge pull request #46 from sergeykalenyuk/improvement

Remove store code prefix from object id because the store code is added ...
Use cookie to save last query (optional feature disabled by default).
Indexing/index settings improvements:

- Add support for custom index settings in config (updates without full reindex).
- Flag index dirty instead of reindexing immediately after product import.
- Skip delete operations for disabled stores.
- Fix broken clean index.
- Remove unnecessary resetSearchResults (caused huge database load after
  mass actions).
- Make indexing product count optional.
- Do not full reindex on product/category delete.