Fix syntax error in icinga_stats collector

Commit fixes syntax error in icinga_stats collector - replace {} with [].
Adds an IP metrics collector
Removes empty documentation fields
Merge pull request #729 from zstyblik/pr-20140916-icinga-fix

Fix syntax error in icinga_stats collector
Merge pull request #731 from willroberts/ipcollector

IPCollector
Per #707, this updates the fixture
Fix arguments to hostname shell error
Merge pull request #733 from lightsofapollo/patch-1

Fix arguments to hostname shell error
Collect postgres replication stats
Merge pull request #734 from paulegan/postgres-repl

Small patch to postgres collector to record replication lag
Fix ip collector tests
pep8
Fixes #735, this adds the flush method so that per collector metrics makes it up to librato correctly
Fixes #650, this disables the pyrabbit test case from travis
Handle DNS resolution error in graphite handler
DatabaseReplicationStats should only be for extended

Not everyone uses replication
Add stats for monitoring xid wraparound
fix #747

added a test as well. reviews of the test are welcom
Merge pull request #748 from m1keil/master

fix #747
Merge branch 'master' of github.com:python-diamond/Diamond