docs: update examples in overview (#317)

* docs: update examples in overview

close #286

* docs: add Makefile

docs/Makefile

@@ -0,0 +1,3 @@
+all:
+	julia --color=yes ./make.jl
+	mkdocs build

docs/src/index.md

@@ -6,28 +6,50 @@
 computing and state-of-art deep learning to Julia. Some highlight of features
 include:
 
-* Efficient tensor/matrix computation across multiple devices, including multiple CPUs, GPUs and distributed server nodes.
-* Flexible symbolic manipulation to composite and construct state-of-the-art deep learning models.
+* Efficient tensor/matrix computation across multiple devices,
+  including multiple CPUs, GPUs and distributed server nodes.
+* Flexible symbolic manipulation to composite and construct
+  state-of-the-art deep learning models.
 
 For more details, see documentation below. Please also checkout the
 [examples](https://github.com/dmlc/MXNet.jl/tree/master/examples) directory.
 
 ## Tutorials
 
 ```@contents
-Pages = ["tutorial/mnist.md", "tutorial/char-lstm.md"]
+Pages = [
+  "tutorial/mnist.md",
+  "tutorial/char-lstm.md",
+]
 Depth = 2
 ```
 
 ## User's Guide
 
 ```@contents
-Pages = ["user-guide/install.md", "user-guide/overview.md", "user-guide/faq.md"]
+Pages = [
+  "user-guide/install.md",
+  "user-guide/overview.md",
+  "user-guide/faq.md",
+]
 Depth = 2
 ```
 
 ## API Documentation
 
 ```@contents
-Pages = ["api/context.md", "api/model.md", "api/initializers.md", "api/optimizers.md", "api/callbacks.md", "api/metric.md", "api/io.md", "api/ndarray.md", "api/symbolic-node.md", "api/nn-factory.md", "api/executor.md", "api/visualize.md"]
+Pages = [
+  "api/context.md",
+  "api/ndarray.md",
+  "api/symbolic-node.md",
+  "api/model.md",
+  "api/initializers.md",
+  "api/optimizers.md",
+  "api/callbacks.md",
+  "api/metric.md",
+  "api/io.md",
+  "api/nn-factory.md",
+  "api/executor.md",
+  "api/visualize.md",
+]
 ```

docs/src/user-guide/install.md

@@ -10,7 +10,7 @@ To install MXNet.jl, simply type
 Pkg.add("MXNet")
 ```
 
-in the Julia REPL. Or to use the latest git version of MXNet.jl, use the
+In the Julia REPL. Or to use the latest git version of MXNet.jl, use the
 following command instead
 
 ```julia
@@ -27,9 +27,9 @@ to point the build-process in the right direction. If the automatic
 cuda detection fails you can also set `CUDA_HOME` to override the process.
 To control which version of libmxnet will be compiled, you can use the
 `MXNET_COMMIT` variable to point to either a version tag (e.g. `v0.10.0`), a
-branch name (e.g.  `master`) or a specific commit hash (e.g. `a0b1c2d3`).
+branch name (e.g. `master`) or a specific commit hash (e.g. `a0b1c2d3`).
 
-The libmxnet source is downloaded to `Pkg.dir("MXNet")/deps/src/mxnet`.
+The libmxnet source is downloaded to `Pkg.dir("MXNet", "deps", "src", "mxnet")`.
 The automatic build is using default configurations, with OpenCV disabled.
 If the compilation failed due to unresolved dependency, or if
 you want to customize the build, you can compile and
@@ -39,12 +39,12 @@ Manual Compilation
 ------------------
 
 It is possible to compile libmxnet separately and point MXNet.jl to a
-the existing library in case automatic compilation fails due to
-unresolved dependencies in an un-standard environment; Or when one want
-to work with a seperate, maybe customized libmxnet.
+existing library in case automatic compilation fails due to
+unresolved dependencies in an non-standard environment; Or when one want
+to work with a separate, maybe customized libmxnet.
 
 To build libmxnet, please refer to [the installation guide of
-libmxnet](http://mxnet.readthedocs.org/en/latest/build.html). After
+libmxnet](https://mxnet.incubator.apache.org/install/index.html). After
 successfully installing libmxnet, set the `MXNET_HOME` *environment
 variable* to the location of libmxnet. In other words, the compiled
 `libmxnet.so` should be found in `$MXNET_HOME/lib`.
@@ -65,7 +65,7 @@ Basically, MXNet.jl will search `libmxnet.so` or `libmxnet.dll` in the
 following paths (and in that order):
 
 -   `$MXNET_HOME/lib`: customized libmxnet builds
--   `Pkg.dir("MXNet")/deps/usr/lib`: automatic builds
+-   `Pkg.dir("MXNet", "deps", "usr", "lib")`: automatic builds
 -   Any system wide library search path
 
 Note that MXNet.jl can not load `libmxnet.so` even if it is on one of