Add Fetch().
Make FetchResult.values slice backed by a C array (without copying the original data) with the method described at https://code.google.com/p/go-wiki/wiki/cgo
Change FetchResult.Step type to time.Duration.
Merge pull request #2 from hnakamur/rrdfetch

Add Fetch().
Some rearrangements
Fix FetchResult.ValueAt()
Quick and dirty fix for printing fetched results to match the output of
rrdtool dump. More proper implementation may be needed (see rrd_dump.c and
rrd_fetch.c in rrdtool).
Remove unused arrayGetDouble().
Merge pull request #3 from hnakamur/rrdfetch_fix

Rrdfetch fix
Merge branch 'master' of github.com:ziutek/rrd
Fix start and end of fetch test for cases step != 1.
Rename FetchResult.RowLen to RowCnt. Loop from start+step to end when printing.
Merge pull request #4 from hnakamur/test_fetch_fix

Fix start and end of fetch test for cases step != 1.