add dtrace config
add placeholder for erlang.shutdown_time
placeholder for datatypes.compression
add leveldb tiered storage configs
backend and dirs
finish draft
all but one
2.0.0 merge
rough draft ready
Merge branch 'features/lp/config-descriptions' into lp/missing-configs
add brief section on  variables
some rearranging
Merge pull request #1101 from basho/lp/missing-configs

Ready: Document missing configs