Global middleware applies to router handler now

Fixed variable scope for mounted net http router

Optimise mount method

Fix go sum server

Fix sub router sub path matching, improve performance

Hotfix root route check

Update fasthttp version

Performance upgrade.

• preselecting root node and matching path agains smaller tree.
• reduced allocations

Data taken from travis builds (before/after):

- BenchmarkStatic1-4              	12678802	        92.1 ns/op	       5 B/op	       1 allocs/op
+ BenchmarkStatic1-4              	25116511	        46.1 ns/op	       0 B/op	       0 allocs/op

This minor version update includes fixes for middleware

• execution order
• middleware to node matching between different node types (static/wildcard etc)