Add document for Navigation controller improvement
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Key: GTNPORTAL-2146
URL:
https://issues.jboss.org/browse/GTNPORTAL-2146
Project: GateIn Portal
Issue Type: Task
Security Level: Public (Everyone can see)
Reporter: Vu Viet Phuong
Navigation controller branch has been finished and merged into trunk, we should have a
section for it in Reference guide of GateIn
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