Tidy up indentation
Add display_formats and formatted value methods

Setup for chromosome numbers to be displayed as integers
Implemented support for Display Formats in traits

Categorical and Continuous traits can now be edited to display their
data differently - default, integer, float, or string for now
Fixed form field bugs

Forms for editing csv_datasets, otus, and taxa weren't rendered properly
Merge pull request #38 from NESCent/chromosome_numbers

Add display format option to traits