convert CSV to XLS (progress towards tp #541)
progress towards tp #541. survey_draft to xls conversion
getting the filename from the form's id_string
properly ordering sheets and columns
updating the pyxform library to a version that supports UTF-8 CSVs
encoding csvs as utf-8 before sending them to pyxform.csv_to_dict
fixing accidental reversion of "showCreateButtons" bug
cleaner exporting of survey_draft to different file_formats
Merge pull request #115 from kobotoolbox/tp541

Tp541
added xlwt to reqs.txt
Merge pull request #117 from kobotoolbox/requirements-quickfix

added xlwt to reqs.txt
pointing to a kobotoolbox fork of pyxform to keep csvs ordered correctly (breaks a pyxform test)
Merge pull request #118 from kobotoolbox/reqs-points-to-forked-pyxform

pointing to a kobotoolbox fork of pyxform to keep csvs ordered correctly...
Added test that breaks if survey_preview generation fails
Fixes error when generating survey_preview
Merge pull request #119 from kobotoolbox/enketo-previews-broken

Enketo previews broken
Fixing tp #600 and providing error message back to the user in a json object
Update form settings and fix form title edit buttons
Update styles of form header options
Fix table cell widths