updated crate-admin to 0.8.1
Merge pull request #842 from crate/h/adminui-0.8.0

updated admin ui to 0.8.1
added gradle task for nightly builds
Merge pull request #843 from crate/h/nightly-task

added gradle task for nightly builds
exclude test classes from coverage report
invalidate only related table infos from cache on meta data change
fixed table info cache invalidation
convert ips to bytesRef if loaded from fieldcache

currently there is no clean way to differentiate between
internal storage format and output format.

So in order to handle ips we need to change them to the
expected output format for now.
implemented ``sys.cluster.settings`` expression
added parser support for `set global column = value`
implemented parser support for `RESET GLOBAL some_setting`
implemented sys.jobs in-memory table including collector
use UUID as job table key
access in memory tables directly instead of using a key
remove tableIdent from routing and isInMemory from TableInfo
add sys.jobs_log table
fix itest
implemented `sys.nodes.thread_pools` expressions
fix changes and use json representation in docs
add the sys.operations table