Index performance optimizations (REPLACE: TREE up to 90%, HASH up to 10%)
Refactoring: space_replace, index_replace and txn_replace methods
txn_rollback fix
Minor fixes in space_replace, index_replace and txn_replace methods
Remove BOX_ADD and BOX_REPLACE from space.m, index.m, tree.m
Tests for space_replace
index-speedup: code review.
Tests for space_replace 2
Remove index::findByTuple method
Remove index::findUnsafe method
Fix a broken link to PHP driver.
Merge branch 'stable'
Merge branch 'master' into index-speedup

Conflicts:
	test/box/lua.result
Merge branch 'index-speedup'
Merge branch 'master' of github.com:mailru/tarantool
try to fix race condition
Add sql.sort = True for a non-uniq index test in big/tree_pk.test
Merge branch 'master' of github.com:mailru/tarantool into ipc-race-condition
has_readers & has_writers methods without race condition
debian version