Omero2pandas

What's Changed
* Handle NaN values in String columns correctly by DavidStirling in https://github.com/glencoesoftware/omero2pandas/pull/11
* **Return FileAnnotation ID** when creating table, not OriginalFile ID by DavidStirling in https://github.com/glencoesoftware/omero2pandas/pull/13
* Use connection manager for keepalives by DavidStirling in https://github.com/glencoesoftware/omero2pandas/pull/20
* Support **CSV inputs for uploader**, link to multiple objects by DavidStirling in https://github.com/glencoesoftware/omero2pandas/pull/19


**Full Changelog**: https://github.com/glencoesoftware/omero2pandas/compare/v0.2.0...v0.3.0

- Fixed a bug when uploading tables with string columns containing missing values
- `upload_table` now returns the FileAnnotation ID as documented, not the OriginalFile ID

**Full Changelog**: https://github.com/glencoesoftware/omero2pandas/compare/v0.2.0...v0.2.1

- (7) Improved validation and error messages when trying to download files which aren't OMERO tables.
- (8) Added support for PyTables query syntax (see docs). This makes it possible to selectively download table data.
- (9) Fixed a bug where OMERO sessions would be closed when supplying an existing connector object to `read_table`.
- (10) Added support for attaching tables to Project and Screen objects