[developers] ERG demo webpages

[Ann Copestake]

it's great to see that the generator button is working on the ERG demo

couple of comments:

I don't think it's a good idea to allow non-sentences through in the demo as 
is happening currently.  The rubric implies one has to enter a sentence, and 
when one just gets MRSs (as by default) the non-sentence nature of some of the 
analyses is very unclear.

the sample `Just try pressing return in this window' probably ought to have 
some punctuation, but maybe rethink the example given what gets generated?
`Try pressing return in this window justly.'

the generate button is active on the generator output but nothing will generate

Cheers,

Ann