Move resolve to its own concern

Shouldn't be exported globally
Only support resolve accept:
Tweak resolve error message
Use proper q value parser
Move resolve to its own concern

Shouldn't be exported globally

Conflicts:
	lib/sprockets/paths.rb
Only support resolve accept:
Tweak resolve error message
Use proper q value parser
Merge branch 'master' into asset-content-negotiation

Conflicts:
	lib/sprockets/resolve.rb