We had a browser check to blacklist all browsers older than IE 8
IE <= 7
But that is no longer required since JS support is not there for such
browsers as per https://www.mediawiki.org/wiki/Compatibility#Modern
We can support all modern browsers listed there and we don't need
additional blacklisting now. From 1.27 onwards, there is no JS loaded
for IE 8 too. So we can just use MW browser support policy.
In this commit, the code to do brower checks removed and simplified
the initialization code. Still I am not happy with the interface module,
that need further refactoring.
Change-Id: I655826c55fb2c7c5c88f16368110142d64a96eec
64eab95b94