Fix state->max_msg being read and written to within same statement.
Merge pull request #3 from bwegge/fix-undef

Fix state->max_msg being read and written to within same statement.
Include stdio.h for FILE * type.

This closes #2.
Handle removal of protobuf_c_default_allocator.

This global was removed in protobuf-c/protobuf-c@3decba7 - this
change immitates the same behaviour.
Update for newest autoconf tools.
Install protobuf-c from github.
Fix #1.
Install dependencies for travis.
And another dependency...
Update dependencies.