initial add of a CHANGELOG, closes #16

CHANGELOG.md

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+# Change Log
+All notable changes to this project will be documented in this file.
+
+- The format is based on [Keep a Changelog](http://keepachangelog.com/) 
+- This project adheres to [Semantic Versioning](http://semver.org/)
+
+## [Unreleased]
+
+
+## 0.0.1 - 2016-08-08
+### Added
+- Initial CHANGELOG file to keep track of changes to Hasper over time.
+- Additionally, Hasper now uses semver and properly tags releases.
+
+## Attribution
+
+Hasper was originally a fork of the [hugo-theme-casper](https://github.com/vjeantet/hugo-theme-casper). However, the original author was not responding to [pull requests](https://github.com/vjeantet/hugo-theme-casper/pull/41). Hasper now lives as its own separate repository and has been updated with the following improvements: 
+
+- author thumbnail fixes across the site (original version only worked on list template): [25467fc](https://github.com/dencold/hasper/commit/25467fc92ca611ae7a6d517c16b47cdac0ae9dcb)
+- switching from bespoke `.Site.Data.Author` in favor of Hugo's canonical `.Site.Author`: [25467fc](https://github.com/dencold/hasper/commit/25467fc92ca611ae7a6d517c16b47cdac0ae9dcb)
+- icon aesthetic improvements, previous styles had ugly underlines: [2238091](https://github.com/dencold/hasper/commit/22380914098cbf0dad119be18d7727521f097a29)
+- removing unused `page` directory which contained duplicate code: [8c2f9e8](https://github.com/dencold/hasper/commit/8c2f9e8c5b138d89e1b5e2c39d2d6210c928ad9f)
+- allowing for external image linking (gravatar, twitter, etc), original theme hardcoded site's base url: [06afad2](https://github.com/dencold/hasper/commit/06afad23845e6e51c0ac55cef29c2e7caf7878d5)
+- share icons are now user-configurable: [b334fed](https://github.com/dencold/hasper/commit/b334fed9c5e88447b98e5908c362f3d165e1ee02)
+- full theme support for [highlightjs](https://highlightjs.org/) code blocks: [a8f2870](https://github.com/dencold/hasper/commit/a8f2870b03a5d48075129372ad7f499f0ac4c2d4)