better markdown

easier to read
#307 - New is_mongos settings to avoid serverStatus call

- Set ```options/is_mongos``` setting to avoid serverStatus mongo
command
Merge pull request #309 from gusnips/patch-1

better markdown
Manually merge #213

- Support for ES 1.31 (Thanks to @jlinn)
Delete comment #321
Update README

- #295
- #321
Document better setup of Eclipse which includes source jars for easier debugging
Merge pull request #334 from benmccann/eclipse-sources

Document better setup of Eclipse which includes source jars for easier debugging
Fixes #240 and #216 Retry mongodb connection
- Retry if mongodb is down while river init till mongodb comes up
- Retry if mongodb isn't reachable while processing the oplog

Conflicts:
	src/main/java/org/elasticsearch/river/mongodb/MongoDBRiver.java