Bump version to 0.2.0

* Following major foregrounds have been implemented:
  + galactic/synchrotron
  + galactic/freefree
  + galactic/snr
  + extragalacitc/clusters
  + extragalacitc/pointsources
    NOTE: this component needs further refactor, improvements,
          integration and tests

* A Web UI build upon the Tornado framework and its WebSocket function
  is implemented and is already barely usable.
  + The Web interface is beautiful and reasonable
  + The configurations manipulation part performs quiet well

* However, there are also many problems with the Web UI:
  + The layout should be more compact and concise
  + There should be some popup/tooltip to reflect the operation results
  + The console that start the server task is current *BLOCKING* (i.e.,
    synchronous), however, the WebSocket currently (Tornado v4.3) does
    not support coroutine for the "on_message" method, which further
    hampers the problem been solved.

fg21sim/__init__.py

@@ -7,7 +7,7 @@
 """
 
 __pkgname__ = "fg21sim"
-__version__ = "0.0.1"
+__version__ = "0.2.0"
 __author__ = "Weitian LI"
 __author_email__ = "[email protected]"
 __license__ = "MIT"