[docs] Schema additions, and monodoc template updates.

- Expanded monodoc-ecma schema to support the 'preserve-mono' attribute, and the attribution tag.
- Added preserve-mono to several pieces of documentation that we would like to preserve across future automated documentation imports: CipherSuitesCallback, ServicePointManager, CultureInfo, Environment+SpecialFolder.xml
- XSL template changes for monodoc HTML generation to support <attribution>

Revert "[llvm] Fix the build."

This reverts commit d6cc132.

Revert this as it doesn't work with the currently used llvm version.

Fix some warnings on !MONO_ARCH_AOT_SUPPORTED targets.

[System] Fix process creation when UseShellExecute is set to false.

This fixes the behavior of process spawning when UseShellExecute is
set to true.

The right behavior is to return no process only when we used the system
launcher. So, spawning /bin/cat should behave in the same way independent
of how UseShellExecute is set.

[PCL]: Add new `System.Runtime.InteropServices.WindowsRuntime' APIs a…

…nd Facade Assembly.

This is a squashed cherry-pick of commits 37af8b7, 7d23865, 1908e1d and d0d5f5a, which
fixes problems with the MS Rx NuGet package.

[runtime] Fix the osx mavericks stack size calculation in sgen too.

Revert my last two commits; these would require a new cecil.

This reverts commits c29ac46
and b31c948.

Bump ikvm again to only pick-up my single commit.

I created a new 'mono-master' branch in ivkm-fork, which is based
at the previous ikvm commit, then cherry-picked my single commit.

Apparently, there are API changes in IVKM which prevent it from
being applied cleanly.

Include all of Martin's spec file changes

Bump version number to 3.2.0