Import the new n-gram tokenizers and filters from Lucene.

Lucene 4.4 will feature new n-gram tokenizers and filters that should not
generate broken offsets (that cause highlighting bugs) anymore. They also
correctly handle supplementary characters and the tokenizers can work in a
streaming fashion (they are not limited to the first 1024 chars of the
stream anymore).
Trimming MVEL scripts before compiling them.

This bypasses an issue with MVEL error handling why can go into an infinite loop in some edge cases. More info here: http://jira.codehaus.org/browse/MVEL-292

Closes #3168
The "fielddata" qs param to index stats was setting idCache, not fieldData

Closes #3204
Expose fielddata "fields" param in standard in indicesStatsRequest

Closes #3205
GeoHash Filter
##############

Previous versions of the GeoPointFieldMapper just stored the actual geohash
of a point. This commit changes the behavior of storing geohashes by storing
the geohash and all its prefixes in decreasing order in the same field. To
enable this functionality the option geohash_prefix must be set in the mapping.

This behavior allows to filter GeoPoints by their geohashes. Basically a
geohash prefix is defined by the filter and all geohashes that match this
prefix will be returned. The neighbors flag allows to filter geohashes
that surround the given geohash cell. In general the neighborhood of a
geohash is defined by its eight adjacent cells.

To enable this, the type of filtered fields must be geo_point with geohashes
and geohash_prefix enabled.

For example:
    curl -XPUT 'http://127.0.0.1:9200/locations/?pretty=true' -d '{
        "mappings" : {
            "location": {
                "properties": {
                    "pin": {
                        "type": "geo_point",
                        "geohash": true,
                        "geohash_prefix": true
                    }
                }
            }
        }
    }'

This example defines a mapping for a type location in an index locations
with a field pin. The option geohash arranges storing the geohash of
the pin field.

To filter the results by the geohash a geohash_cell needs to be defined.
For example
    curl -XGET 'http://127.0.0.1:9200/locations/_search?pretty=true' -d '{
        "query": {
            "match_all":{}
        },
        "filter": {
            "geohash_cell": {
                "field": "pin",
                "geohash": "u30",
                "neighbors": true
            }
        }
    }'

This filter will match all geohashes that start with one of the following
prefixes: u30, u1r, u32, u33, u1p, u31, u0z, u2b and u2c.

Internally the GeoHashFilter is either a simple TermFilter, in case no
neighbors should be filtered or a BooleanFilter combining the TermFilters
of the geohash and all its neighbors.

Closes #2778
Add Lucene CommonGrams/CommonGramsQuery token fiter
Both filters merged in a single "common_grams" tokenfilter.

Closes #3202
Added version support to update requests

Moved version handling from RobinEngine into VersionType. This avoids code re-use and makes it cleaner and easier to read.

Closes #3111
stabelize more tests
Terms Filter Lookup: Failure when no mappings for the terms field exists (no data indexed)
closes #3216
improve geohash_filter to use terms filter
and various other cleanups
Fix NumericTokenizer.

NumericTokenizer is a simple wrapper aroung a NumericTokenStream. However, its
implementations had a few issues: its reset() method was not idempotent,
causing exceptions if reset() was called twice (causing #3211) and it had no
attributes, meaning that the only thing it allowed to do is counting the number
of generated tokens. The reason why indexing numeric data worked is that
the mapper's parseCreateField directly generates a NumericTokenStream and
by-passes the analyzer.

This commit makes NumericTokenizer.reset idempotent and makes consuming a
NumericTokenizer behave the same way as consuming the underlying
NumericTokenStream.
Lookup Terms Filter _cache parameter not being taken into account
fixes #3219
better handling of null filters when caching them
Reduced geobulk data
only call terms lookup once and not per segment
Added Arabic/PersianNormalizationFilters from Lucene
properly set the set flag
Deleting or closing an index doesn't clean the memory properly
fixes #3232