Update release notes
Update RELEASE_NOTES.md
[#68] Added a 'clean' target for the GAE Ant build.
[#68] Added explicit compilation options for JDK 1.6 and UTF-8 encoding.
[#68] Corrected compilation errors for JSONObject constructor use.
[#68] Added ignore statements for Gradle builds.
[#68] Updated GAE build.properties template for GAE SDK 1.7.6 and GWT 2.5.1.
Also removed unused properties.
[#68] Added ignore statement for Eclipse tool build configs.
Also grouped Eclipse specific ignore statements together.
Merge branch 'develop' of github.com:akvo/akvo-flow into feature/deployment
[#68] Refactored build.xml to reduce duplication.
[#68] Added compile_server.sh script for use in CI builds.
Merge branch 'master' of github.com:akvo/akvo-flow into develop
Merge branch 'feature/deployment' of github.com:akvo/akvo-flow into develop