- Quick and dirty first version of a by-revision crawler.
- Another test of crawling, with SVNLogClient this time. Performance is terribad.
- cleanup, clarifying one test.
- First step to sequentialize indexing.
- introducing SubversionRevision for a hopefully more logical implementation.
- SubversionCrawler rewritted, first unit test passed.
- Seems fine so far. No more insane memory consumption, even if the indexing is slower with a reasonable bulk size.
Merge branch 'sequential-crawler'

Conflicts:
	elasticsearch-river-subversion.iml
	src/main/java/org/elasticsearch/river/subversion/SubversionCrawler.java
- Results are good enough so far. No reason to stick to the old document model.