fix a bug where :NERDTreeToggle was broken without :set hidden
updates to the doc

*remove the change log prior to v3.0.0
*remove the todo section
*change "about the author" to "about" and put the github/vim.org project
urls in it
add a note to the changelog
bugfix: use TreeDirNode.GetSelected() instead of getSelectedDir()
make the q mapping work with secondary trees
fix a bug when doing :NERDTreeMirror without 'hidden set
ensure all secondary nerd tree buf names are unique
use the s:nextBufferName() helper in s:createTreeWin()
remove some trailing whitespace
fix the q mapping again

since we are now ":edit"ing a new buffer for secondary nerd trees, we
have to store the previous buffer number otherwise we get into an
infinite loop because we go back to a directory buffer which causes
another secondary nerd tree to open etc
update changelog
fixes to secondary nerd trees for the q mapping

make sure we always go back to the right buffer, and if there is no
buffer to go back to, close the window
unlet TreeDirNode#open because we are overriding it
fix a bug where going :NERDTree <relative-path> would fail

Path.New was expecting an absolute path. Now we convert paths to
absolute inside Path.New
update change log and credits
switch to version 3.0.1
add s and gs for vsplitting the current node
add mapping options for g and gs
add g and gs to the guickhelp
bugfix: make the vsplit maps work when the tree is on the left