Merge pull request #90 in YIN/basic from bugfix/YIN-242 to master

# By Jiadong.Han (6) and others
# Via Jiadong.Han (5) and others
* commit 'fc6b0924728df328d1b448a81eb6738e6daababa':
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  make the pictures align centrer
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  contact us can't link
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  modify some small problems
  Registration page message not center
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  upload database
  beautify the pages