When something is selected, use indent mode instead of smart mode

[oakmac]

Shaun says:

This might be related to Issue #28

[shaunlebron]

This is automatically done by the library:
https://github.com/shaunlebron/parinfer/blob/master/lib/parinfer.js#L1543

The API just needs to know if any text is selected or not, which it receives via the options.selectionStartLine.

The API also uses this option for tab stops, but it just needs to be non-null if any selection is made.