fix inverted ssl compression

Apache 2.4 defaults SSLCompression Off. The ssl module provides a
parameter for ssl_compression which defaults false. If it is set
to true, the template actually would add another SSLCompression Off
stanza (not the expected SSLCompression On).
allow global setting of SSL cipher

ssl_cipher is setable per vhost already, this makes it an option
that can be sent once per the entire configuration instead of at
each vhost.
Merge pull request #688 from sdague/master

ssl tweaks