v0.4.0

• #27 Remove [ ] wrapping icons
• #26 Add detection and warning on unsupported (old) NERDTree versions
• updated readme with more links and new details on new features and conifgs
• #30 Improve vim standard plugin conventions and tips
• #30 work on sections and standard plugin conventions part 1
• #30 clean-up of unused (for now) autoload file
• #28 setting global options broken part 1
• #29 Add vimdoc, more updates
• autogenerating vimdoc using html2vimdoc
• readme updates