Create changelog.

CHANGELOG.md

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+Change log
+====
+
+monsoon-2.1
+----
+
+Features:
+- New component: Remote History server.  
+  **Note**: protocol is not entirely stable and may change in the future.
+- Implemented Sun RPC history protocol.
+- Aggregated queries now accept a time specification.  
+  Example: ``percentile_agg[1h](75, monsoon timing.'collectors')``
+- Step-size based iterations use Interpolation to fill in missing values.
+- Collectors now use a builder pattern, so new collectors won't need parser changes.
+
+Bug fixes:
+- Rate query now correctly interpolates values for previous scrape.
+- Pipeline builders now work correctly, if supplied with API server.
+- Work around spontaneous reactor shutdown in URL collectors.
+
+monsoon-2.0
+----
+
+- Opensourced monsoon!