Preserve quotes when parsing Accept/Reject-Contact headers, but strip them when doing comparisons
Merge pull request #682 from Metaswitch/accept_contact_require

[Reviewer: Andy] Preserve quotes when parsing Accept/Reject-Contact headers, but strip th...
Add sub_max_expires parameter
Add sub-max-expires to valid options
Fix typo
Use standard bash check
Revert bash change
Use correct bash check
Merge pull request #684 from Metaswitch/iss660

[Reviewer: Rob] Add sub_max_expires parameter
Code coverage for custom headers, including checking that cloning doesn't leak memory
Prevent quadruple-free error on shutdown
Merge pull request #688 from Metaswitch/crash_on_shutdown

[Reviewer: Andy] Prevent quadruple-free error on shutdown
Merge pull request #687 from Metaswitch/custom_header_coverage

[Reviewer: Andy] Code coverage for custom headers, including checking that cloning doesn'...
Update cpp-common
Merge pull request #692 from Metaswitch/cpp_update

[No reviewer] Update cpp-common and app-servers
UT URL-unescaping function
Clearer subscription events for SAS logging
UT changed function
Add SAS log on transport failure
Separate errors for transport failure and transaction timeout