+ Change the order the environment variables are set such that the local
and release packages env. vars. can be reused instead of being
hardcoded.
+ Derive the packages search path from the local and release packages
env. vars. instead of hardcoded strings (substitued at configure time)
for more flexible behaviour/usage.
+ Set a package_ROOT CMake variable - it can be useful!
+ Operations in boolean expressions are case-sensitive.  See
http://www.cmake.org/Wiki/CMake/Language_Syntax#IF_and_WHILE_control_the_flow.
+ Add a footer to the variant build output - this is useful to bookend
the process for log parsing (such as with the console log parser plugin
in Hudson/Jenkins).
 + Fix a bug with the env map.  The current implementation looks like a
refactor bug from when this logic was in config.py.  The env map using
with parsing export env. vars. (from Rez 1.0) is updated to correctly
support CMAKE_MODULE_PATH and is renamed for clarity.
+ Preserve backwards compatibility by using a default environment
separator map if none is provided by the user.  This correctly handles
the setting of CMAKE_MODULE_PATH to use ; instead of :.  Although a
better solution is required for this problem overall, this maintains the
functionality.
+ 'initial_environ' is not a kwarg for ActionManager. switching to
'parent_environ'.
+ Expose the resolved environment CMAKE_MODULE_PATH variable such that
Rez can still prepend it's own value to this path.  Current
implementation of ActionManager using parent_environ doesn't allow for
this otherwise.
+ Delete all code (except license) after the 'exit' call, it's confusing as it's no longer used...
+ Remove documentation, leave this to rez_.py so that it doesn't become outdated.
+ Update to be a thin wrapper like other rez-* scripts.
+ Add 'cmake' as valid subcommand.
+ Sort subcommand list alphabetically for easier reading.
+ Get BUILD_SYSTEMS from dedicated cmake module.
+ Delegate getting of cmake args to cmake module.
+ Delegate getting of cmake args and BUILD_SYSTEMS to cmake module.
+ First pass of cmake helper module.
+ Minor bug fixes to previous commits.
+ Fix CMake developer warning about mismatching if/endif arguments.
+ Fix kwarg and local variable name clash.