Prepare for 0.1.1
Merge branch 'ycm-0.1'

Conflicts:
	appveyor.yml
	help/release/index.rst
	internal-modules/YCMVersion.cmake
YCMInternal: If available, use the new "MESSAGE_NEVER" argument for install command
Update release notes
Merge branch 'MESSAGE_NEVER' into ycm-0.1
Merge branch 'ycm-0.1'
Download and use CMakePackageConfigHelpers from CMake master

The new CMakePackageConfigHelpers version has an INSTALL_PREFIX argument
for configure_package_config_file that simplifies a lot the creation of
a config file for the binary tree.
InstallBasicPackageFiles: Use the new INSTALL_PREFIX argument for CMakePackageConfigHelpers
Update release notes
Merge branch 'INSTALL_PREFIX'