Get Rid of Compiler Warningings in the vector Package

[jbouffard]

When implementing the easy imports for the vector package, there was an oversight, and WKT and WKB were imported twice in the same file. This leads to the following warning when compiling:

[warn] /home/jake/Documents/projects/geotrellis/vector/src/main/scala/geotrellis/vector/io/package.scala:19:33: imported `WKB' is permanently hidden by definition of value WKB in package vector
[warn] import geotrellis.vector.io.wkb.WKB
[warn]                                 ^
[warn] /home/jake/Documents/projects/geotrellis/vector/src/main/scala/geotrellis/vector/io/package.scala:20:33: imported `WKT' is permanently hidden by definition of value WKT in package vector
[warn] import geotrellis.vector.io.wkt.WKT

We should should get remove the double import so those warnings will go away.

[jbouffard]

We're probably going to want to get this resolved before the 3.0 release.

[jpolchlo]

This will be handled by #2932, if it gets accepted

[pomadchin]

Closed via #2932