Updates and bug fixes to puppet-mode.el

A jumbo update for the Puppet Emacs mode. This update does the
following:

• Fix indentation of array contents when the first element of the array isn't on the same line as the opening of the array.

• Fix indentation of the else and elsif line and after a ") {" line that ends the parameters to a define and starts the body of the define.

• Indenting a line no longer moves the point to the position following the indentation unless the line is entirely whitespace.

• Update font lock keywords with all the latest Puppet keywords.

• The type face is now used properly for all resource types. Previously, some of them would show up as the keyword face because they were also keywords. puppet-mode is now smarter about figuring out the context.

• regexp-opt is now used to make keyword matching more efficient.

• Clean up unnecessarily-complex code and refactor somewhat.

• Add standard elisp library file headers and footer.