docs: highlight shell-codes in CONTRIBUTING.md

Signed-off-by: Fedor Indutny <fedor@indutny.com>

CONTRIBUTING.md

@@ -9,7 +9,7 @@ through the process.
 Fork the project [on GitHub](https://github.com/joyent/node) and check out
 your copy.
 
-```
+```sh
 $ git clone git@github.com:username/node.git
 $ cd node
 $ git remote add upstream git://github.com/joyent/node.git
@@ -48,7 +48,7 @@ does not align with that of a project maintainer.
 Okay, so you have decided on the proper branch.  Create a feature branch
 and start hacking:
 
-```
+```sh
 $ git checkout -b my-feature-branch -t origin/v0.10
 ```
 
@@ -59,7 +59,7 @@ $ git checkout -b my-feature-branch -t origin/v0.10
 
 Make sure git knows your name and email address:
 
-```
+```sh
 $ git config --global user.name "J. Random User"
 $ git config --global user.email "j.random.user@example.com"
 ```
@@ -99,7 +99,7 @@ what subsystem (or subsystems) your changes touch.
 
 Use `git rebase` (not `git merge`) to sync your work from time to time.
 
-```
+```sh
 $ git fetch upstream
 $ git rebase upstream/v0.10  # or upstream/master
 ```
@@ -111,7 +111,7 @@ Bug fixes and features should come with tests.  Add your tests in the
 test/simple/ directory.  Look at other tests to see how they should be
 structured (license boilerplate, common includes, etc.).
 
-```
+```sh
 $ make jslint test
 ```
 
@@ -134,7 +134,7 @@ node ./test/simple/test-streams2-transform.js
 
 ### PUSH
 
-```
+```sh
 $ git push origin my-feature-branch
 ```
 

README.md

@@ -12,26 +12,32 @@ Prerequisites (Unix only):
 
 Unix/Macintosh:
 
+```sh
 ./configure
 make
 make install
+```
 
 With libicu i18n support:
 
+```sh
 svn checkout --force --revision 214189 \
    http://src.chromium.org/svn/trunk/deps/third_party/icu46 \
    deps/v8/third_party/icu46
 ./configure --with-icu-path=deps/v8/third_party/icu46/icu.gyp
 make
 make install
+```
 
 If your python binary is in a non-standard location or has a
 non-standard name, run the following instead:
 
+```sh
 export PYTHON=/path/to/python
 $PYTHON ./configure
 make
 make install
+```
 
 Prerequisites (Windows only):
 
@@ -48,30 +54,42 @@ and OS X installers will prompt you for the location to install to.
 The tarballs are self-contained; you can extract them to a local directory
 with:
 
+```sh
 tar xzf /path/to/node-<version>-<platform>-<arch>.tar.gz
+```
 
 Or system-wide with:
 
+```sh
 cd /usr/local && tar --strip-components 1 -xzf \
                     /path/to/node-<version>-<platform>-<arch>.tar.gz
+```
 
 ### To run the tests:
 
 Unix/Macintosh:
 
+```sh
 make test
+```
 
 Windows:
 
+```sh
 vcbuild test
+```
 
 ### To build the documentation:
 
+```sh
 make doc
+```
 
 ### To read the documentation:
 
+```sh
 man doc/node.1
+```
 
 Resources for Newcomers
 ---