gh-79 fix (check realloc result)
fixes, follows from discussion https://github.com/tarantool/tarantool/issues/79#issuecomment-29309533
Merge remote-tracking branch 'origin/stable' into gh-79-check-realloc-result
Merge remote-tracking branch 'origin/stable' (gh-79)

Conflicts:
	src/box/tree_index.cc
	src/box/tree_index.h
	test/big/tarantool.cfg
	test/box/errinj.result