Added robots.txt: robots.txt is added currently in src/browser/public/robots.txt because that's what is served at root with current Pyjamas implementation, this should change when Pyjamas will be removed (for Libervia 0.8). Current version uses "Allow" which is not recognized by all crawlers, but major ones should do.

try:
    from common.constants import Const as C
except ImportError:
    pass # import doesn't work at this stage with pyjamas
else:
    __version__ = C.APP_VERSION