Add support for liveness timeout on transactions to ASs
Make members public - otherwise won't build without no-access-control compiler option
Add support for default_handling=CONTINUE
Unit tests and fixes
Handle error after 100 Trying correctly - should not do CONTINUE processing in this case
Merge dev branch and fix merge conflicts
Merge pull request #115 from Metaswitch/sto364

[Reviewer Matt] Dead AS detection and default handling
Temporarily disable new test case causing failures
Fix leaking AsChains
Merge pull request #118 from Metaswitch/sto364

[No review required] Fix leaking AsChains
Fix memory issues around AsChainLink lifetime and reinstate disabled test
Merge pull request #119 from Metaswitch/sto364

[No reviewer] Fix memory issues around AsChainLink lifetime and reinstate disabled test
Add references to TCP transports created by UT to prevent PJSIP killing them
Merge pull request #120 from Metaswitch/sto364

[No reviewer] Add references to TCP transports created by UT to prevent PJSIP killing them
Remove references to AsChainLink in call services, use one stored in UASTransaction for redirects
Use .next() to get next AsChainLink in AS chain for redirect
Merge pull request #122 from Metaswitch/sto364

[Reviewer Matt] Remove references to AsChainLink in call services, use one stored in UAS Transaction for redirects