As of today, January 22th 2016 we won't be making any further improvements or updates on Remote Transformations (including the executor interface in Transformations and all remote transformations, eg. Text Splitter)
As of February 22th 2016 Remote Transformations functionality will be completely removed from Transformations.
Text Splitter functionality can be replaced by an R transformation, see the demo code.
Contact our support, if you need any assistance with migration to R transformation.