CHANGELOG modified.

Author: edoardolombardi

CHANGELOG.md

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+# Change Log
+All notable changes to this project will be documented in this file.  
+This project *tries* to adhere to [Semantic Versioning](http://semver.org/).
+
+## [Unreleased]
+### Added
+- Unique Octant 2D/3D class.
+- Base ParaTree class and derived 2D/3D classes.
+
+## v0.4.0 - 2015-11-10
+### Added
+- This CHANGELOG file.
+- CMAKE folders, files and new custom variables for ccmake precompiling.
+- make check for testing serial and parallel version of PABLO.
+- Active option for building documentation in ccmake setup.
+
+### Changed
+- Installation and building instructions.
+
+### Fixed
+- Include instruction in Class_Log.
+
+### Removed
+- Temporary tests for bug fixing.
+