add api function that gets the last time a friend was seen online
retain old data file friendlists on load
Merge pull request #802 from JFreegman/master

add api function that gets the last time a friend was seen online (also ...
Disabled shared lib when building vs. nacl library
Merge pull request #807 from jin-eld/fix-nacl-builds

Disabled shared lib when building vs. nacl library