Next SDK we will be changing branch/tag naming scheme from
sdk-1.x.yyy to vulkan-sdk-1.x.yyy

closes #1107

Update the loader documentation in the following ways:
 1. Move documentation to new "docs" folder"
 2. Split LoaderAndLayerInterface.md into multiple docs to focus
    on target audience:
      - Top-Level     LoaderInterfaceArchitecture.md
      - Applications  LoaderApplicationInterface.md
      - Layers        LoaderLayerInterface.md
      - ICDs          LoaderImplementationInterface.md
 3. Upload newer images and their corresponding original Inkscape files.
 4. Cleanup and update sections on Linux directory search
 5. Add new sections to detail items missing
      - VkConfig
      - Handling undef Fuchsia
 6. Language cleanup

Thanks to @charles-lunarg and @smcv for feedback and various section language
corrections.

the COPYRIGHT.txt file itself was removed in https://github.com/KhronosGroup/Vulkan-Loader/commit/d7452989ff0cfbaeaecfb63d8516cab63cf41bee

Change-Id: Ie33ffe2d58f737a98b28a51cb90026bfdbcbd88a

Change-Id: I98fbb73d85b14560c901c86264500c927ac679b4

Change-Id: I774ceb555f38eff24d2b69ce83ea638f1ea53138

Change-Id: I92bebd8a33df564daff1b44633e79b56ffa6ae86

Initial check-in for mock icd which is being built to allow validation
testing without the need for an actual Vulkan device.

ICD is currently building and passing 324/332 tests. It creates ptr
handles for dispatchable objects and unique id handles for
non-dispatchable objects. It currently has some hard-coded values for
various Get* device-query functions in order to allow forward progress.
The long-term intention is to allow the device configuration to be set
by the test itself.

See the ICD README.md file for more info.

Better to show status only for master branch Travis builds.  Other branches frequently fail and cause the badge to not reflect the status of the master branch.

Update the README.md to have a note about updating your Nvidia
driver to resolve failures with the glslang hack removal.

Change-Id: Id1b71cc7baae90571bef624f07ff1c7511718b0c

This reverts commit 94dd6081.

Change-Id: Ie5b437d822c5efe6baf0baf2830591f50bf3ee4d

Remove executable bit from files like README.md

Change-Id: I6a2a86e8312616c175845f0a3b777515a58c52b9

Change-Id: I129b4d074f0604bbdf6d81c052333229ece99ac3

Change-Id: Ic1f192ea7c95762d7e53f091cc9f0ea55be96c04

Change-Id: I32685ef02c245557315a3e44c65eb8c8cf62f9f4

Change-Id: Id447f4c8c53d33f9192940bdd3ae727b7b738a97

Change-Id: Idba8b7e07d3a71e49c01e406825b96ccbb342efa

Updated DRI3 discussion in README.md and BUILD.md.