Disable OpenCL platform on known-buggy macs
Change API reference links to 6.0
units on getPMEParameters
Make element basically immutable
Merge pull request #402 from rmcgibbo/docs

Change API reference links to 6.0
Merge pull request #403 from rmcgibbo/units

units on getPMEParameters
Merge pull request #401 from rmcgibbo/disable

Disable OpenCL platform on known-buggy macs
Merge pull request #404 from rmcgibbo/imutable-elements

Make element basically immutable
Fixed bug in OpenCL implementation of GBSA on CPU devices
Merge pull request #407 from peastman/master

Fixed bug in OpenCL implementation of GBSA on CPU devices
Removed _d suffix from debug libraries
File missing from previous commit
Merge pull request #408 from peastman/debug

Removed _d suffix from debug libraries
Added missing serialization support for CustomNonbondedForce interaction groups.
Undid some debug info.
Undid an erroneous commit.
Undid more erroneous changes.
Rolled back one more change.
Added missing serialization for some other properties of CustomNonbondedForce.
Updated tests of serialization of CustomNonbondedForce, though test omits comparison of interaction group sets since I couldn't figure out how to do that.