Fixes Matrix parse issue

The behavior of Applicable function has changed in v0.6, due to this
change, the matrix parsing was not happening on v0.6, this commit fixes
that issue.

Author: bmharsha

src/APIResponder.jl

@@ -90,8 +90,8 @@ end
 
 """call the actual API method, and send the return value back as response"""
 function call_api(api::APISpec, conn::APIResponder, args, data::Dict{Symbol,Any})
-    try
-        if !applicable(api.fn, args...)
+    try       
+        if !applicable(api.fn, args...) || ((api.fn === (*) || api.fn === (/) || api.fn === (\)) && all(x->isa(x,Vector), args))
             narrow_args!(args)
         end
         result = dynamic_invoke(conn, api.fn, args...; data...)