removed & now ignoring .sln file.
fixed compile error caused from missing _contentManager.
removed unused _membershipService variable.
fixed typo.
added new feature to the README.
Found an Error in Log files

Was getting a null reference exception every minute or do in the log
file for orchard due to the conext being null when the indexing service
was running.
Merge remote-tracking branch 'excommunicated/master' into fix/null-context-throwing-exception
added null check on User to prevent exception from happening and filling up the log.
Merge branch 'fix/null-context-throwing-exception'