Add support checking metrics against individual series rather than all.
Merge branch 'feature-checkvaluetype' into feature-all

Conflicts:
	cabot/cabotapp/graphite.py
Fix missing comma within series hash.
Merge branch 'feature-checkvaluetype' into feature-all

Conflicts:
	cabot/cabotapp/graphite.py
Fix for missing renames from series to all_series.
Merge branch 'feature-checkvaluetype' into feature-all
Change graphite metric check error formatting slightly.
Merge branch 'feature-checkvaluetype' into feature-all