Merge pull request #89 from stopyro/master

add support for environment variables with env.yml
handle YAML.load_file returning --- string
Merge pull request #91 from jgawor/env

handle YAML.load_file returning --- string
doc changes to java_opts framework
Merge pull request #92 from Samuel1989/master

doc changes to java_opts framework
update link to index.yml file
Merge pull request #93 from jgawor/link

Update link to index.yml file