Replace Still Maintained status with Travis-CI.
Replace Still Maintained status with Travis-CI.

http://stillmaintained.com/ shut down August 1, 2012.

lellimecnar/assetic,kriswallsmith/assetic,mubassirhayat/assetic,renaatdemuynck/assetic,matthiasmullie/assetic,Sgoettschkes/assetic,mubassirhayat/assetic,renaatdemuynck/assetic,shandy05/assetic,kriswallsmith/assetic,kriswallsmith/assetic,shandy05/assetic,Sgoettschkes/assetic,lellimecnar/assetic,renaatdemuynck/assetic,lenar/assetic,Sgoettschkes/assetic,lenar/assetic,matthiasmullie/assetic,shandy05/assetic,Sgoettschkes/assetic,mubassirhayat/assetic,shandy05/assetic,matthiasmullie/assetic,lellimecnar/assetic,lellimecnar/assetic,kriswallsmith/assetic,renaatdemuynck/assetic,lenar/assetic,matthiasmullie/assetic,lenar/assetic