Update m4 file to not check for library linkage

We went header only, so the antioch.m4 check should not be checking
for a library to link against anymore.
Make utility function inline

When compiling in GRINS, the compiler complained about multiple
definitions of of this function. Making it inline fixed it for me.
Not sure why there weren't any complaints within Antioch proper.
Updated CHANGES for 0.0.7 and 0.0.8 releases
Antioch is hosted on GitHub now.
Bump version number to 0.0.8
Don't distribute docs in the tarball

Should take care of #19.
Merge pull request #33 from pbauman/0.0.8_prep

0.0.8 prep
Merge branch 'master' of https://github.com/libantioch/antioch into photochemistry