add changelog

CHANGELOG.md

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+BRouter-Web Changelog
+=====================
+
+## 0.5.0 (2015-07-01)
+
+### Features
+
+* Load profile content for selected profile (needs extra server locally)
+* Bing maps aerial layer (not working locally)
+* track color magenta instead of blue + white casing, for better contrast  
+  with background map (esp. OpenCycleMap)
+* transparency slider for route track and markers
+* button to delete route (#10)
+* map scale
+* download all dependencies in a bundle, instead using CDNs and separate files (#18)
+* switch search plugin for result-dependent zoom
+* "about" popup with a bit more infos and links
+* closable error/warning messages, profile messages in place
+
+### Bugfixes
+
+* keys to enable/disable drawing (d, q/esc) now always work, not only when map is focused
+* fix adding new waypoint after deleting the last (#11)
+* fix profile/data scrolling on Firefox
+* hide trailer over controls and outside map
+
+
+## BRouter 1.2
+
+* data/CSV aggregated over segments with same tags (for better performance)
+
+## 0.4.0 (2015-03-08)
+
+* data tab (slow with long routes, exp. on Firefox)