Commits on Aug 18, 2017

1. Add the ability to yield a message. …

   Standard loggers in Ruby mostly `yield` their messages (this is the default behavior of Ruby's own logger.) Or if there is a block then the message is the topic, a colon is automatically added, and the message is shipped with the topic.  Jekyll should conform to this behavior so that it's logger can be passed to libraries that expect this standard behavior.
   
   ```ruby
   [1] pry(main)> Jekyll.logger.info("Just so you know") # => Just so you know
   [2] pry(main)> Jekyll.logger.info("Just so you know", "this is a message") # => Just so you know this is a message
   [3] pry(main)> Jekyll.logger.info("Just so you know") { "this is a message" }
     # => Just so you know: this is a message
   ```
   
   Signed-off-by: Parker Moore <parkrmoore@gmail.com>

   

   Jordon Bedwell authored and parkr committed Aug 18, 2017
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2. Add missing &block params & fix Rubocop errors.

   

   parkr committed Aug 18, 2017
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3. LogAdapter: bail early if the log level is higher than log message

   

   parkr committed Aug 18, 2017
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4. LogAdapter: centralize logic for writing.

   

   parkr committed Aug 18, 2017
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5. Only log at :error by default

   

   parkr committed Aug 18, 2017
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