Add grep/group for, like `ag --group`
Fix scattering of candidates in grep/group
Subgroup feature
Passing test feature group
Subgroup feature
Subgroup feature, using splits in groups
Merge branch 'master' of https://github.com/Shougo/unite.vim
Add documentation for tree feature
Inital tree.vim with two helper functions for the tree feature

The adapt functions manipulates the tree for another view:

- adapt_bottomup, will 'reverse' the tree to let you traverse it from the leaves
  and up

- adapt_filter, will make it easy to access all candidates
Delete relative word in find source
Extend switch action to support source.buffer