#238 Provide ability to update only single field (or particular set of fields) during model save

[devMls]

Allow specify columns to update

Allow specify columns to update in the methods save and saveit

If the specification is done, the validations will not be trigged

[ipolevoy]

@devMls what is this about? Can you please create an issue and explain this, see: http://javalite.io/contributors

Also, please use the same format for commits "#123 Issue title - additional comments".

[ipolevoy]

@devMls can you please see my comments above? Just sending commits is not helpful. Also, your code has no associated tests.

[devMls]

Hi.

I try to resolve this issue:

#238

Where vyemialyanchyk asking for a way to update only some fields, for avoid to get all record from database, or manage a clob field for update only a boolean.

With this functionality you can:

model.save("field1, field2");
I find this helpful, this week i will implement tests.

[ipolevoy]

@devMls all commits must follow a pattern as I described above. Can you please:

1. Close this PR
2. Create a new PR and commit messages that follow the rules
3. Add tests around new functionality