Tests: Fix randomizedtest fail

Closes #49
Update to Lucene 4.10.2

Closes #50
update documentation with release 2.4.1
upgrade to lucene 5 snapshot
Upgrade to Lucene 5.0.0-snapshot-1637347
Upgrade to Lucene 5.0.0-snapshot-1641343
Upgrade to Lucene 5.0.0-snapshot-1642891
Analysis: Use PreBuiltXXXFactory

  Closes #34
Depend on elasticsearch-parent

To simplify plugins maintenance and provide more value in the future, we are starting to build an `elasticsearch-parent` project.
This commit is the first step for this plugin to depend on this new `pom` maven project.
[Maven] best practice: add always groupId
romanji -> romaji
Docs: revise examples
(cherry picked from commit 14ac3b0)