Correspondence to Apache Lucene 4.5.x, and detailed change of java_scr

* It corresponds to Lucene-5114 [remove boolean useCache param from TermsEnum.seekCeil/Exact].
  https://issues.apache.org/jira/browse/LUCENE-5114

  TermsEnum.SeekStatus seekCeil(BytesRef text, boolean useCache) is removed@Lucene 4.5.x

* "final" is added to the variable which is not changed.
* The processing which judges whether it is effective in logger is added.
Merge remote-tracking branch 'origin/develop' into refactor/rz/latest-lucene-api

Conflicts:
	java_src/com/basho/yokozuna/handler/EntropyData.java
Upgrade to Solr 4.6.0

* Removed clustering component because it isn't properly setup and
  have never tested it.

* Removed various comments which have changed in latest example
  solrconfig.xml. I figure it makes more sense to have a cleaner
  config then outdated comments.
Merge pull request #243 from basho/refactor/rz/latest-lucene-api

Upgrade to Solr 4.6.0