Support for database

[pinkynrg]

So this is not an issue, it is more a question. I was thinking about modifying this library so that instead of having a config file to load data from a file I would have all configurations from the db for my rails application.

This would be beneficial for a few reasons:

1. I can modify/delete any unit runtime.
2. I can add "functional" units without the need to write new code or make new commits.

Do you think it would be an incredible pain for me to try achieving the above?

[pinkynrg]

I tried to patch this awesome gem to make it work with the database:

https://github.com/pinkynrg/unitize

So basically I used this gem's engine without preloading any atoms (initial state empty array). If the user wants, it is possible to import the atoms in the UCUM code system executing a rake task.

In the database, there are 2 extra columns as well, "code_function_from" and "code_function_to" for all those units that need a function to be converted (see Celsius to kelvin for example.)

Would anyone be interested to help me make it a little less patchy?