GLSL interpolation qualifiers and auxiliary storage qualifiers are not
mutually exclusive. So when they are translated to SPIR-V decorations, two
independent utility methods should be employed to do this job.

Fixes issue #252.

Build: atoi comes from stddef.h or cstddef

This is required to fix the Android build for ARM.

Test compiling shaders with given resource limits using GTest.

Fix the slow down in noContraction propagation

There have been GLSL extensions considering this, and HLSL does it.
This is a fully backward compatible change that allows this distinction.

Addresses issue #205.
Current open Khronos bug for finalizing this.

Nonfunctional: Remove declaration for ShGetPhysicalAttributeBindings

The function ShGetPhysicalAttributeBindings() is declared in the
header, but not defined (or referenced) anywhere in the codebase.

Reflection: Add support for querying vertex attributes in reflection API

Parser: Redeclaration of gl_CullDistance is disallowed mistakenly.

Testing: Add link tests in the GTest framework

SPV: Fix missing location decoration for structures put directly on input/output interfaces

Spec for decorating the OpVariable:
	"The remaining variables listed by OpEntryPoint with the Input or Output storage class form the user-defined variable interface. These variables must be identified with a Location decoration"

Spec for decorating struct type:
	"The layout of a structure type used as an Input or Output depends on whether it is also a Block (i.e. has a Block decoration).
	If it is a not a Block, then the structure type must have a Location decoration"

Merge branch 'struct_member_decorations' of https://github.com/scyganINTEL/glslang into scyganINTEL-struct_member_decorations

SPV: Correct an issue in createUnaryMatrixOperation().

Type of the source is not necessarily the same as that of the destination.

VS2010 compilation fixes

These capabalities were added on declaration of the members, but
that is considered too aggressive, as those members are automatically
declared in some shaders that don't use them.  Now, actual access
is needed to make the capabalities be declared.