fix default sort so it sorts by number instead of order opened#127

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thasmin wants to merge 3 commits intofholgado:masterfrom

Commits on Oct 15, 2014

fix default sort so it sorts by number - useful when closing and reopening buffers or when opening buffers in background (via vimgrep or others)
thasmin
committed
properly sort numbers as numbers instead of as strings
thasmin
committed

Commits on Feb 2, 2015

fixed ordering by removing bracket in front
thasmin
committed