travis: clicking the status button takes to build page
added ssh peer identification string
loosen the constraint on base
added sftp documentation
make now more verbose
Merge branch 'primitives'

This merge is a provisional stabilisation of the Hash interfaces of
the raaz-primitives package.
Merge branch 'ssh'

A provisional merge of the ssh package.
got rid of some checkouts fixes #21
compressSingle and default definition of compress in terms of compressSingle