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add  How to customize your generator templates
Merge pull request #1 from zmbacker/master

Add instructions how to customize your generator templates (particulary erb)
Add an argument which can define prefix name

add an command argument named —prefix_name=“xxxx”
correct  option name of prefix_name
test of prefix_name option
Change Readme
Merge branch 'master' into develop
Merge branch 'master' of github.com:zmbacker/rails-admin-scaffold into zmbacker-master
Merge branch 'zmbacker-master' into develop