Add support for pre-compiled libvips on ARM CPUs

Uses a HypriotOS-managed docker container for this

docs/api.md

@@ -635,7 +635,7 @@ var counters = sharp.counters(); // { queue: 2, process: 4 }
 _Requires libvips to have been compiled with liborc support_
 
 Improves the performance of `resize`, `blur` and `sharpen` operations
-by taking advantage of the SIMD vector unit of the CPU.
+by taking advantage of the SIMD vector unit of the CPU, e.g. Intel SSE and ARM NEON.
 
 * `enable`, if present, is a boolean where `true` enables and `false` disables the use of SIMD.
 
@@ -650,7 +650,7 @@ have been known to crash under heavy load.
 
 ```javascript
 var simd = sharp.simd();
-// simd is `true` is SIMD is currently enabled
+// simd is `true` if SIMD is currently enabled
 ```
 
 ```javascript

docs/changelog.md

@@ -4,6 +4,10 @@
 
 #### v0.12.2 - TBD
 
+* Upgrade libvips to v8.2.0 for improved vips_shrink.
+
+* Add pre-compiled libvips for ARMv6+ CPUs.
+
 * Ensure 16-bit input images work with embed option.
   [#325](https://github.com/lovell/sharp/issues/325)
   [@janaz](https://github.com/janaz)

docs/install.md

@@ -17,7 +17,7 @@ npm install sharp
 libvips and its dependencies are fetched and stored within `node_modules/sharp` during `npm install`.
 This involves an automated HTTPS download of approximately 6MB.
 
-Most recent 64-bit Linux-based operating systems should "just work", e.g.:
+Most recent Linux-based operating systems running on x64 and ARMv6+ CPUs should "just work", e.g.:
 
 * Debian 7, 8
 * Ubuntu 12.04, 14.04, 14.10, 15.04, 15.10
@@ -25,12 +25,13 @@ Most recent 64-bit Linux-based operating systems should "just work", e.g.:
 * Fedora 21, 22, 23
 * openSUSE 13.2
 * Archlinux 2015.06.01
+* Raspbian Jessie
 
 Preference will be given to an existing globally-installed (via `pkg-config`)
 version of libvips that meets the minimum version requirement.
 This allows the use of newer versions of libvips with older versions of sharp.
 
-For older and 32-bit Linux-based operating systems,
+For older Linux-based operating systems and 32-bit Intel CPUs,
 a system-wide installation of the most suitable version of
 libvips and its dependencies can be achieved by running
 the following command as a user with `sudo` access