Improve compression rate by up to 50% (with dictionary)
Fix UT to match new compression settings
Merge pull request #41 from Metaswitch/sas-compression

[Reviewer: Jim] Improve compression rate by up to 50% (with dictionary)
Allow event timestamps to be overriden
Tweak testcase name
Do not allow timestamps on markers to be overriden
Merge pull request #42 from Metaswitch/timestamp_override

[Reviewer: Jim] Timestamp override
Merge remote-tracking branch 'origin/master' into no-compression