Adjust m2cat to new biomodels url structure

## Trac Ticket #10
**component:** code
**owner:** somebody
**reporter:** martinP
**created:** 2016-09-06 11:48:53
**milestone:** 
**type:** defect
**version:** 
**keywords:** 

Apparently biomodels has changed their URL schema, causing the file discovery for BMDB to be broken.