Fix STORE-269- PART-1

The servicex uses an option-text field which was not supported by the Publisher extension mechanism.

The fix involved:
- The addition of the options.txt.js client side script which is used to render option text and handle management operations.
-The rendered options text control allows addition and deletion of fields. 
-Adding support to check the options text field type in the form exporter

Additions:
-The store now ships with a bare bones servicex.rxt which contains an option text field (contacts) used for testing
-The publisher now contains a servicex.json file in the examples directory.This file can be placed in the config/ext/ folder to enable servicex support in the Publisher

To do:
-Add comments to the options.text script (This is generic and can be used to render options text field controls)
-Refactor and improve the options.text script

Known issues:
-There is a known client side issue with the edit operation which causes the option text field to be reset to default values