Minor bug fix for mapping process

When assigning a value to a field failed and this field contained spaces
the importing process would froze due to a javascript error that raised.
When replacing the spaces in the field name with underscores the error
is fixed.
GdtImporter version update
Update of gdt version
Revert "Update of gdt version"

This reverts commit e8bd14a7b91179bbb68c314a60d5078670039bf2.
Merge pull request #3 from sethsnel/master

Minor bug fix for mapping process