support dynamic name directory in template

[toshiwo]

support dynamic name directory in template

before

motion create foo --template=my_template
  Create foo
  Create foo/app/app_delegate.rb
  Create foo/Gemfile
  Create foo/lib/foo/bar.rb # lib/{name}/bar.rb
/Library/RubyMotion/lib/motion/project/template.rb:110:in `initialize': No such file or directory - lib/foo/bar.rb (Errno::ENOENT)

after

motion create foo --template=my_template
  Create foo
  Create foo/app/app_delegate.rb
  Create foo/Gemfile
  Create foo/lib/foo/bar.rb # lib/{name}/bar.rb
  Create ...

[Watson1978]

If I created template as following,

my_template/
└── files
    └── lib
        └── {name}
            └── {name}.rb.erb

The directory name is changed dynamically. Good.
However, "{name}.rb.erb" is not changed :(

% motion create sample --template=my_template 
    Create sample
    Create sample/.gitignore
    Create sample/lib/sample/{name}.rb

I guess that #sub method should be changed to #gsub method in https://github.com/HipByte/RubyMotion/blob/master/lib/motion/project/template.rb#L121