Cleanup API for extending realize methods and for allowing users to realize the Component to the desired computational stage.
Convert Component::get(set)StateVariable() to get(set)StateVariableValue() to reflect that StateVariable object is not returned and only the value.
Rename Component methods to reflect that the get/set method is affecting the value of StateVariable, CacheVariable, DiscreteVariable and not the object itself. This is now consistent with getOutputValue() and getInputValue() methods. Fixes issue #163.
Propogate rename to getStateVariableValue
Removed OLDconvertAngVelDotToQuaternionDotDot()

This method was removed and is a remnant of a stale Rotation.h that is being held in the OpenSim repo for the purpose of wrapping. This seems wrong and should be addressed in another PR.
Merge pull request #258 from opensim-org/RenameAccessorsToVariableValue

Rename Component get/set to refelect returned variable value
Rename non-virtual realize methods which also got renamed.
Merge branch 'master' into extendComponentRealizeMethods
implement non-virtual realize methods for Stage::Time through to Report.
Use the Component interface to realize the system in testComponentInterface.cpp
Add meaningful error message to Component::getSystem if system in null. This can only happen if the Component has not added itself to the system or if Model::initSystem() has not been called.
Fixes #192.
[doxygen] Touch up Component::findComponent.
Update Component.h
High level realization methods were removed from Component. It was agreed that only the top-level (aggregator) should have that ability to realize the system and only to provide access for scripting users.
The C++ API is complete since any Component including model provides getSystem() and realize(State, Stage) can be called directly on the system.

Added realize<Stage> methods to Model to provide access via scripting where the MultibodySystem and Stage are not wrapped.

These need to be tested via scripting.

An assortment of fixes to find and replace bugs that renamed realize<...> to extendRealize<...> in comments that were refering to the System methods and not virtual methods on Component.
Merge pull request #265 from opensim-org/fix-component-doxygen

[doxygen] Touch up Component::findComponent.
Merge pull request #262 from opensim-org/removeIncludesFromDoxygen

Remove includes from doxygen
[cmake] Refine comment for OPENSIM_SIMBODY_DOXYGEN_LOCATION

See discussion in #192.
Merge pull request #267 from opensim-org/cmake-simbody-docs-comment

[cmake] Refine comment for OPENSIM_SIMBODY_DOXYGEN_LOCATION
Merge pull request #261 from opensim-org/extendComponentRealizeMethods

Extend component realize methods and addreses #184
Resolve merge conflicts.
Clean up iterator docs; fix memory leak.