Added "serving uploaded files" section to README

Fixes #98
Updated all jnicklas github references to carrierwaveuploader
Fixed the build for Mongoid 4.0
Add a section for configuring routes for the carrierwave url
Merge pull request #101 from pencilcheck/patch-1

Add a section for configuring routes for the carrierwave url
Updated readme docs on route configuration

Ref #101
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Merge branch 'master' of github.com:carrierwaveuploader/carrierwave-mongoid

Conflicts:
	README.md
	carrierwave-mongoid.gemspec
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