Implementation change and some features and some corrections

[sumpygump]

I should have broken down the changes into smaller commits, but let me give a run down of the major changes.

• Moved the file to be an ftplugin (file-type plugin) so it is automatically sourced when *.php files are opened
• Added defaults to the configuration settings allowing for overrides in users' .vimrc files
• Added option to select which tags to be included an in which order for PHP class docblocks
• Corrected detection of the float var type (the float check in PhpDocType() should be called AFTER the int check because the int regex also matches for floats and will override it inadvertently).
• Corrected detection of bool var type (in the regex, the escaping backslashes need to be escaped).
• Updated usage information and suggestions as well as updated the formatting of the file comments
• Cleaned up the code slightly to ensure indentation was consistent (removed some tabs)