Refs #90: perform refactor on check_traces
Refs #90: add comparison when regular view id is the same but previous trans view id is not the same
Refs #90: if reg view is same but next trans view has different members, then members should be disjoint. remove some redudant comparison and use std::inserter to avoid fixed size output container
Merge pull request #134 from codership/gh90

Gh90
Updates to admin guide.  Fixed bad link on Reference.
Documentation moved to https://github.com/codership/documentation
refs #71 tstamp only by messages that are directly from peer, fixes to gcs gcomm backend cleanup
refs #139 - made PC send errors to match gcs core counterparts to
            have appropriate error codes from backend in gcs
            core sending.
Merge pull request #140 from codership/gh139

refs #139 - made PC send errors to match gcs core counterparts to  have appropriate error codes from backend in gcs core sending.
Merge branch '3.x' into gh71
refs #71 fixed error propagation in case of gcs gcomm backend error