test definitions for Fig configuration of mem_limit
added config documentation for Fig mem_limit option
test implementations for Fig mem_limit config
Implementation in FigConfiguration for mem_limit config option
Merge branch 'master' into fig-config-memory-limit-FLOC-962
addresses review comments
Merge pull request #966 from ClusterHQ/fig-config-memory-limit-FLOC-962

Fig config memory limit floc 962