Fixes #68 - Implemented address masking script

pages/address-masking.md

Index: pages/address-masking.md
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+title=Address Masking
+description=Use address masking to avoid spam.
+
+# Address masking
+
+Use address masking to avoid spam.
+
+## Usage
+
+### Step 1: Include script on page
+
+Include the following script at the bottom of a page:
+
+```
+<script src="/js/address-masking.js"></script>
+```
+
+### Step 2: Base64 encode addresses
+
+Base64 encode sensitive `href` addresses into `data-address` attributes.
+
+#### Markdown (before processing)
+
+```
+[Private Email](#){: data-address="bWFpbHRvOnVzZXJuYW1lQGV4YW1wbGUuY29t" }
+```
+
+#### HTML (before processing)
+
+```
+<a data-address="bWFpbHRvOnVzZXJuYW1lQGV4YW1wbGUuY29t">Private Email</a>
+```
+
+#### Output (after processing)
+
+```
+<a href="mailto:username@example.com">Private Email</a>
+```
+
+## Example
+
+<script src="/js/address-masking.js"></script>
+
+<a data-address="bWFpbHRvOnVzZXJuYW1lQGV4YW1wbGUuY29t">Private Email</a>