Remove deprecated tiled operations.

Histogram, Max, and Min have been in geotrellis.statistics.op.stat for some
time and should be used instead of these operations.
Update test to use current stat operations.
Update Min to use new Reducer abstract class.
Replace logic.Reducer1 with logic.TileReducer1.

logic.Reducer1 is an earlier implementation of an abstract base class
for operations that can apply map/reduce style operations on tiled rasters.

It is replaced with TileReducer1, which is similar to ThoroughputLimitedReducer1.
Moving forward, we should remove both Reducer1 and ThoroughputLimitedReducer1,
as well as implement TileReducerN operations, but that isn't included in this
commit.
Update benchmarks to use current tiled stat operations.
Added Downsample operation.
Modified doc string
Add geotools maven repository to conscript.
Add mapfish repository to conscript.
Add opengeo repository to conscript.
Improve test coverage

Split out the rest of int.scala into appropriate test files.
Add gt-tool script to replace conscript gt-tool.

This gt-tool script downloads the task binary from a cache in
.geotrellis or in the local sbt target directory.
Properly concatenate reference.conf when building assembly.
Merge pull request #409 from joshmarcus/topic/gt-tool-fixes

Add script for running gt-tool binary.
Added GeotiffBatchImportTask
Fixed bug in ARG writing for Bool.
Modified travis.yml to build all subprojects.
Set environment variable in travis.yml for conscript
Add deprecated annotation to Reducer1.

TileReducer1 should be used in place of Reducer1.
Merge pull request #394 from joshmarcus/topic/tilereducer

Replace Reducer1 with TileReducer1.