Fix meta-data format

1a1a816 Fix: use most recent meta data representation
9111b84 Extend test case to use another scale: RRD_ABSOLUTE
2337d73 Don't use ld(1) option --version-script on Darwin (OS X)
2204b0c Merge pull request #9 from robertbreker/remove-parson-from-librrd.h
aa28120 Merge pull request #8 from robertbreker/clean-librrd.so
bade598 Merge pull request #7 from robertbreker/restrict-exports
f113c83 Don't include parson.h in librrd.h
51ed5f6 Add version script to prevent SO namespace collisions