author  Johann Sorel

Indicate if this resolver need a base path to create a resolver.
Example :

• The operating system file resolver is absolute.
• A zip archive resolver is not absolute.

Indicate if this path can be used.
For non-absolute resolvers.
Absolute resolvers should always return false.
param  base
return  true if it can be used
throws  IOException

Create path resolver.
param  base, need only if resolver is not absolute.
return  PathResolver, never null
throws  IOException if something goes wrong