master_timeout parameter is now taken into account when calling cluster pending tasks api through the REST layer

Closes #4806
[TEST] Added missing newline at end of YAML test file
[TEST] Added missing \n at end of YAML files, quoted * and fixed indentation
Accept the same boolean values in RestRequest

Added `no` as a possible value to `paramBooleanAsOptional`, also reused existing code from `Booleans.parseBoolean`

Closes #4808
Fix logging on immediate exit on start

If elasticsearch was started in the foreground an immediate exit on startup
led to logging in the logfile, where as when starting in the background,
an immediate exit logged to stdout.

Closes #4805
Follow-up of #4808, same fix applied to ToXContent.MapParams
Return `MatchNoDocsQuery` if query string is emtpy

Closes #3952
Return a conflict when trying to enable/disable norms.

Close #4761
Make StringFieldMapper.toXContent aware of defaults for not_analyzed fields.

StringFieldMapper.toXContent uses the defaults for analyzed fields in order to
know which options to add to the builder. This means that if the field is not
analyzed and has norms enabled, it will omit to emit `norms.enabled: true`.
Parsing the mapping again will result in a StringFieldMapper that has norms
disabled.

The same fix applies to index options.

Close #4760
Add page tracking to MockPageCacheRecycler.

This found an issue in BytesRefHash that forgot to release the start offsets.

Close #4814
Initial implementation of custom _all field

Closes #4520
Added setup task that clears the test template before running exists_* tests
River does not start when using config/templates files

From elasticsearch 0.90.6, when you have templates files defined in `config/templates` dir, rivers don't start anymore.

Steps to reproduce:

Create `config/templates/default.json`:

```javascript
{
  default:
  {
    "template" : "*",
    "mappings" : {
      "_default_" : {
      }
    }
  }
}
```

Start a dummy river:

```sh
curl -XPUT 'localhost:9200/_river/my_river/_meta' -d '{ "type" : "dummy" }'
```

It gives:

```
[2014-01-01 22:08:38,151][INFO ][cluster.metadata         ] [Forge] [_river] creating index, cause [auto(index api)], shards [1]/[1], mappings [_default_]
[2014-01-01 22:08:38,239][INFO ][river.routing            ] [Forge] no river _meta document found, retrying in 1000 ms
[2014-01-01 22:08:38,245][INFO ][cluster.metadata         ] [Forge] [_river] update_mapping [my_river] (dynamic)
[2014-01-01 22:08:38,250][INFO ][river.routing            ] [Forge] no river _meta document found, retrying in 1000 ms
[2014-01-01 22:08:39,244][INFO ][river.routing            ] [Forge] no river _meta document found, retrying in 1000 ms
[2014-01-01 22:08:39,252][INFO ][river.routing            ] [Forge] no river _meta document found, retrying in 1000 ms
[2014-01-01 22:08:40,246][INFO ][river.routing            ] [Forge] no river _meta document found, retrying in 1000 ms
[2014-01-01 22:08:40,254][INFO ][river.routing            ] [Forge] no river _meta document found, retrying in 1000 ms
[2014-01-01 22:08:41,246][INFO ][river.routing            ] [Forge] no river _meta document found, retrying in 1000 ms
[2014-01-01 22:08:41,255][INFO ][river.routing            ] [Forge] no river _meta document found, retrying in 1000 ms
[2014-01-01 22:08:42,249][WARN ][river.routing            ] [Forge] no river _meta document found after 5 attempts
[2014-01-01 22:08:42,257][WARN ][river.routing            ] [Forge] no river _meta document found after 5 attempts
```

With elasticsearch 0.90.2 or with no template file in `config/templates` dir, it gives:

```
[2014-01-01 22:22:32,096][INFO ][cluster.metadata         ] [Forge] [_river] creating index, cause [auto(index api)], shards [1]/[1], mappings []
[2014-01-01 22:22:32,221][INFO ][cluster.metadata         ] [Forge] [_river] update_mapping [my_river] (dynamic)
[2014-01-01 22:22:32,228][INFO ][river.dummy              ] [Forge] [dummy][my_river] create
[2014-01-01 22:22:32,228][INFO ][river.dummy              ] [Forge] [dummy][my_river] start
[2014-01-01 22:22:32,234][INFO ][cluster.metadata         ] [Forge] [_river] update_mapping [my_river] (dynamic)
```

Closes #4577.
Closes #4656.
Ignore empty config paths
[SPECS] Updated percolator specs.
[TESTS] Added percolator rest tests.