Merge pull request #500 from joelmo/master

Stop Unite from overriding `startinsert` autocommands with `stopinsert`
Fix ack option
Fix spelling, grammar and typo mistakes in the documentation
Merge pull request #503 from ciwchris/DocCleanUp

Fix spelling, grammar and typo mistakes in the documentation
Improve expand()
Improve error detection
Fix no_start_insert behavior
Fix buffer directory behavior
Fix rename issue
Improve rename behavior
Add documentation
Fix documentation
fix doc typo
Add unite#path2directory()
Merge pull request #513 from lodagro/patch-1

fix doc typo
Fix #511 jump_list behavior
Fix #514 add g:unite_cursor_line_time
Add g:unite_source_find_default_opts option
Merge pull request #516 from Genki-S/add_unite_source_find_default_opts

Add g:unite_source_find_default_opts option
add modified buffer filter to buffer source