move prepare crowd section as a first step and adjust crowd support install instructions
Crowd chapter rework for Nexus 2.7 crowd support
fix heading levels and spellings
delete crowd figs no longer used
fix eval section for Crowd
step and image tidy
correct image name
rework wording that references crowd and ldap together
one last image rename

..where's the clean?
fix pointless bold * and also explicitly describe some internal jump links since how these are named is not consistent across pdf/html versions
Merge pull request #21 from sonatype/crowd-plugin-2.7

NXCM-5497 - update to latest Crowd support work in Nexus 2.7