more on nek
Add check whether finalize was already called.
setup_proxy
Fixed #666: Segfault on calling hpx::finalize twice
Adding ticket to docs
Merge branch 'master' into executors

Conflicts:
	src/hpx_init.cpp
Adding version image slides
Fixing some more issues reported by PVS Studio
dssum
cg
Update examples/accumulator/managed_accumulator_client.cpp

Fixed managed accumulator example
CMake: Re-add option that was removed.
Improve warning message for mappings limitation.
Add roll_release script.
gop
Fixed accumulator example
Adding minimal resource_manager to executors
Merge branch 'master' into executors
Merge branch 'master' into executors