Display defaults with help to reduce complications for new users.

Instead of needing to type:
`python logstash_index_cleaner.py -\-host localhost -\-p 9200 -p logstash- -d 30`
You could just type:
`python logstash_index_cleaner.py -d 30`
And have the same thing.
Bump minor version number.
Improve README
Merge pull request #10 from untergeek/master

Show defaults to make things easier for new users.  Improve documentation.