Reformat .ctags and add support for sections in yaml
Remove phpdoc/ plugin and add new phpdoc mapping

I never used phpdoc much anyways because I found that it was too
aggressive about adding redundant information. E.g. a list of parameters
where the parameter names make it very clear what the parameter accepts.
However, I often have need to add some notes to the documentation via a
docblock and I like to declare authorship information, etc. Therefore,
I've decided to replace the plugin with this one simple mapping.
Add tagbar support for yaml sections
NERDTree show hidden files
Add plugin trailing-whitespace (highlights trailing whitespace)