Add CMake script to allow user to `make framework` for iOS

Change-Id: Id28edc209bd8406129f757fada076050d80ffc3f
Remove shell script for creating VTK framework; update iOS readme

Change-Id: I19f5a6850ab0bdc659b755d38658606e514ee0bd
Update CMakeLists for iOS examples

Also, set vtk.framework path in Xcode projects to CMake default.

Change-Id: Iebe4b9eff435c26ef8d6a254487275198ac8f23e
Merge topic 'improve-ios-cmake' into master

628febb8 Update CMakeLists for iOS examples
48752aec Remove shell script for creating VTK framework; update iOS readme
7465b7b4 Add CMake script to allow user to `make framework` for iOS
Added previous signature back for MapScalars() method

Even though the MapScalars() method is designated an internal method
in vtkScalarsToColors and vtkDiscretizableColorTransferFunction
classes, backwards compatibily for outside classes that override this
method was broken by a signature change for the method in commit
94498364811db232990cc7eabb5497d6cb55d3a2. Hat tip to Marcus Hanwell
for identifying the problem with the previous commit and suggesting
the fix.

Change-Id: I78c05ae4041bb07c9ec3978c4e6cc6e80433d871
Merge topic 'MapScalarsBackwardsCompatibility' into master

dafe5a0b Added previous signature back for MapScalars() method