Reformat license header for consistency
Added licene-maven-plugin to build

The plugin adds basic checks for license headers. At
this stage we only enable checks for java source files.
Other files are omitted at this point.
Fixes NPE in bool filter, when an empty should filter clause returns a DocIdSet, but null as iterator.

Closes #4685
REST Update Settings API should not take timeout and master_timeout as index parameters
closes #4692
Geo clean Up
============
The default unit for measuring distances is *MILES* in most cases. This commit moves ES
over to the *International System of Units* and make it work on a default which relates
to *METERS* . Also the current structures of the `GeoBoundingBox Filter` changed in
order to define the *Bounding* by setting abitrary corners.

Distances
---------
Since the default unit for measuring distances has changed to a default unit
`DistanceUnit.DEFAULT` relating to *meters*, the **REST API** has changed at the
following places:

  * `ScriptDocValues.factorDistance()` returns *meters* instead of *miles*
  * `ScriptDocValues.factorDistanceWithDefault()` returns *meters* instead of *miles*
  * `ScriptDocValues.arcDistance()` returns *meters* instead of *miles*
        one might use `ScriptDocValues.arcDistanceInMiles()`
  * `ScriptDocValues.arcDistanceWithDefault()` returns *meters* instead of *miles*
  * `ScriptDocValues.distance()` returns *meters* instead of *miles*
        one might use `ScriptDocValues.distanceInMiles()`
  * `ScriptDocValues.distanceWithDefault()` returns *meters* instead of *miles*
        one might use `ScriptDocValues.distanceInMilesWithDefault()`
  * `GeoDistanceFilter` default unit changes from *kilometers* to *meters*
  * `GeoDistanceRangeFilter` default unit changes from *miles* to *meters*
  * `GeoDistanceFacet` default unit changes from *miles* to *meters*

Geo Bounding Box Filter
-----------------------
The naming of the GeoBoundingBoxFilter properties allows to set arbitrary corners
(see #4084) namely `top_right`, `top_left`, `bottom_right` and `bottom_left`. This
change also includes the fields `topRight` and `bottomLeft` Also it is be possible to
set the single values by using just `top`, `bottom`, `left` and `right` parameters.

Closes #4515, #4084