fixup env template use of jvm.xmx .xms .xmn v max_heap_size and heap_new_size
Merge pull request #55 from BrynCooke/master

Add datastax agent capability
Merge pull request #53 from dpkp/jvm_xmx_fixup

fixup env template use of jvm.xmx .xms .xmn v max_heap_size and heap_new...
remove extra resource defination "service[cassandra]", add node attribute node.cassandra.service_name to support enterprise version dse
Merge pull request #56 from RMCookbooks/service_name

remove extra resource defination "service[cassandra]", add node attribut...
Add release attribute and concatenate to version specified to yum_package.