newrecord~
update record
Rename dl => offset for readiblity
required dot version
Add --enable-graphviz option for graphviz:

Graphviz API is changed in 2014* version.
And the version on ubuntu 13.10  is 2013*
Which causes build fail.
update README
Add lib_LIBRARIES option to Makefile.am
workable --enable-graphviz
update version
clean up configure.ac
update LICENSE
Add license to readme
Add include header to synopsis