Problem: whitespace style too restrictive.

For header only library like cppzmq, whitespace style inherited from
libzmq is too restrictive.

Solution: relaxing whitespace before parens from always to in control
statements only, increased max column width from 80 to 85 and removing
requirement of whitespace after template keyword.

demo/main.cpp

@@ -1,6 +1,6 @@
 #include <zmq.hpp>
 
-int main (int argc, char **argv)
+int main(int argc, char **argv)
 {
     zmq::context_t context;
     return 0;