GEOMESA-287,GEOMESA-303 Handle transformations in command line export In...

...vestigate export behavior when exporting with -a id

To test this PR, sample commands can be found at https://geomesa.atlassian.net/browse/GEOMESA-287.

PR # - Base_Branch:accumulo1.5.x/1.x
Unnecessary braces:

```scala
val attributesArray = if(load.attributes == null) Array[String].empty else load.attributes.split("""(?<!\\),""")
```