Deeply nested package structure

[MrPowers]

spark-daria follows the standard Scala / Java deep nesting package convention that's annoying when importing code.

Users currently need to import code like this: import com.github.mrpowers.spark.daria.sql.ColumnExt._

I noticed that some libraries are deviating from these Scala conventions and offering imports like this: import utest._.

Maybe we can change the package structure so users can import code like import mrpowers.daria.sql.ColumnExt._? Thoughts @nvander1 / @manuzhang...?

[manuzhang]

Yes, the package name is too long although I don't have a good idea for a shorter one. Maybe daria._ is enough ?