Add shpec package

Pulls in a slightly modified verson of shpec's own README.

Author: rylnd

_posts/2015-05-05-shpec.md

@@ -0,0 +1,101 @@
+---
+layout: post
+title: "shpec"
+description: "Test your shell scripts"
+category: bash
+tags: [bash testing bdd]
+---
+
+This package provides a command for testing your shell scripts.
+
+## Using shpec
+[shpec's repo](https://github.com/rylnd/shpec) itself is using shpec, so feel free to use it as an example.
+Here is the basic structure that you'll want:
+
+    └── shpec
+        └── an_example_shpec.sh
+        └── another_shpec.sh
+
+Then to run your tests:
+
+{% highlight bash %}
+shpec [shpec_files]
+{% endhighlight %}
+
+If you'd like your tests to run automatically when they change, we recommend the [entr](http://entrproject.org/) utility:
+
+{% highlight bash %}
+find . -name "*_shpec.sh" | entr shpec
+{% endhighlight %}
+
+### Examples
+[shpec's own tests](https://github.com/rylnd/shpec/tree/master/shpec/shpec_shpec.sh)
+are a great place to start. For more examples, see the [wiki page](https://github.com/rylnd/shpec/wiki/Examples)
+
+### Matchers
+The general format is:
+
+    assert matcher arguments
+
+where `matcher` is one of the following:
+
+#### Binary Matchers
+{% highlight bash %}
+equal         # equality
+unequal       # inequality
+gt            # algebraic '>'
+lt            # algebraic '<'
+match         # regex match
+no_match      # lack of regex match
+{% endhighlight %}
+
+#### Unary Matchers
+{% highlight bash %}
+present       # string presence
+blank         # string absence
+file_present  # file presence
+file_absent   # file absence
+symlink       # tests a symlink's target
+test          # evaluates a test string
+{% endhighlight %}
+
+#### Custom Matchers
+Custom matchers are loaded from `shpec/matchers/*.sh`.
+
+For example, here's how you'd create a `still_alive` matcher:
+
+{% highlight bash %}
+# in shpec/matchers/network.sh
+still_alive() {
+  ping -oc1 "$1" > /dev/null 2>&1
+  assert equal "$?" 0
+}
+{% endhighlight %}
+
+Then you can use that matcher like any other:
+
+{% highlight bash %}
+# in shpec/network_shpec.sh
+describe "my server"
+  it "serves responses"
+    assert still_alive "my-site.com"
+  end
+end
+{% endhighlight %}
+
+## Installation
+You can either install with bpkg
+{% highlight bash %}
+$ bpkg install -g shpec
+{% endhighlight %}
+or with curl
+{% highlight bash %}
+sh -c "`curl -L https://raw.github.com/rylnd/shpec/master/install.sh`"
+{% endhighlight %}
+
+or with [antigen](https://github.com/zsh-users/antigen) for zsh by
+putting `antigen bundle rylnd/shpec` in your `.zshrc`
+
+## Links
+* [Source Code (GitHub)](https://github.com/rylnd/shpec);
+* Author: [Ryland Herrick](https://github.com/rylnd);