Apply Cassandra memory fix when installing Homestead as well
Code review feedback
Merge pull request #45 from Metaswitch/cassandra_mem

Apply Cassandra memory fix when installing Homestead as well
Add decent tracing and overload control to Crest API
Code review updates
Merge pull request #53 from Metaswitch/sto443

[Reviewer Andy] Add decent tracing and overload control to Crest API
Fix exceptions caused by code review updates
Merge pull request #54 from Metaswitch/sto443

[No reviewer required] Fix exceptions caused by code review updates