Fix install locations per FHS and allow to customize them (#958)

* Fix install locations per FHS and allow to customize them

Include built-in cmake module GNUInstallDirs that defines customizable
CMAKE_INSTALL_* variables with common defaults per FHS.

New FS structure when installed with `CMAKE_INSTALL_PREFIX=/usr`,
`BUILD_SHARED_LIBS=ON`:

    usr
    ├── bin
    │   ├── asm2wasm
    │   ├── s2wasm
    │   ├── wasm-as
    │   ├── wasm-dis
    │   ├── wasm-opt
    │   └── wasm-shell
    ├── include
    │   └── binaryen-c.h
    ├── lib64
    │   └── libbinaryen.so
    └── share
    │   └── binaryen
    │       ├── binaryen.js
    │       └── wasm.js
    └── src
        └── js
            ├── binaryen.idl
            ├── binaryen.js-extended.js
            ├── binaryen.js-post.js
            └── binaryen.js-pre.js

See https://cmake.org/cmake/help/v2.8.7/cmake.html#module:GNUInstallDirs
for more information about used variables.

Fixes #951

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