Merge pull request #49 from bcachet/master

Condition HTTP connector compilation
added contributions to authors.txt
added reference projects
Don't free memory you didn't have allocated yourself.
Merge pull request #50 from MiLk/delete

Don't free memory you didn't have allocated yourself.
fix installation of headers
Merge pull request #51 from caktux/master

fix installation of headers
added further references
Merge branch 'master' of github.com:cinemast/libjson-rpc-cpp