Update CHANGELOG

Add changes based on commit history and milestone 4.1.4

Author: clearkimura

CHANGELOG

@@ -1,3 +1,17 @@
+4.1.4 - 2815f71 - 2016-12-31
+------------------------------
+* Updated version in debian/changelog, Makefile
+* Revised debian/changelog
+* Fixed inconsistent text and versioning (#146)
+* Fixed dependent files for GUI (#143)
+* Revised manual with better text, relative links (#142)
+* Fixed typo and comment in qemu.py (#78)
++ Implemented INSTALL script to make installation easier (#141, pr#151)
++ Implemented unique version for "old stable" (#144)
++ Added custom icons for authentication dialog (#148, pr#150)
++ Added contributing guidelines (#147)
++ Added docs/workflow.md to explain work flow (#138)
+
 4.1.3 - 228049f - 2016-10-30
 ------------------------------
 * From this release, reference commit refers to last relevant commit