Update installation.rst

Add note to help with issues as reported here: http://stackoverflow.com/questions/27085384/c-extension-for-murmur3partitioner-was-not-compiled
Info log when connections established to 'up' nodes

PYTHON-116
Merge pull request #217 from datastax/PYTHON-116

PYTHON-116 - Info log when connections established to 'up' nodes
Remove ./debian directory

Based on recommendation of Debian OpenStack maintainer, in accordance with https://wiki.debian.org/UpstreamGuide#Pristine_Upstream_Source
Remove debian references from release procedure.