acu118023 implement GlobalSession V3
acu118023 make hostname-guessing logic more useful
acu118023 fix default-versioning logic and specs.
acu118023 bump version to 3.0.0 and regenerate gemspec with tighter right_support constraint
Merge branch 'teal_13_14_acu127020_missing_rescue' into teal_13_11_acu118023_global_session_v3

Conflicts:
	VERSION
	global_session.gemspec
acu118023 refactor expired-session exception fix using new exception classes in RightSupport.
acu118023 fix miscellaneous broken specs
acu118023 stop requiring msgpack since it's optional now.
accu118023 use a more graceful way to test for Rails presence
acu118023 label cuke cases a bit more clearly
acu118023 stop using gitted right_support
Merge pull request #15 from rightscale/teal_13_11_acu118023_global_session_v3

Global Session v3 - new wire format, better docs, minor bugfixes.