* Now catch requests connection errors

* Feature: multiple time series to dataframe

* Support 'ms' in _datetime_to_epoch

* Fixed issue where switch_db would cause infinite recursion

* Released SeriesHelper

- Added pandas support (DataFrameClient)

- Added warning on write_points_with_precision (deprecated)
- Added warning on switch_db (renamed to switch_database)
- Added warning on get_database_list (renamed to get_list_database)

Bump version to v0.1.13

Bump version

Bump version.