This patch adds a new implementation of UUID library.
New library generates RFC4122 compatible random-based (version 4)
UUIDs using data from /dev/(u)random. The uuidgen(2) syscall is also
supported on BSD system. `struct tt_uuid` redefined from RFC4122.
Complimentary functions rewrotten to remove dependecy on e2fs libuuid.
Lua bindings refactored to use new library and support all features.

Closes #317

Fix Mac OS X Lion build by not adding -rdynamic by default.
Only use -rdynamic on Darwin (Konstantin Knizhnik's Mac).

Conflicts:
	src/box/lua/call.cc
	src/lua/init.cc
	test/box/net.box.result
	test/box/net.box.test.lua

Conflicts:
	doc/www-data.in/download.cmake

This patch also fixed bug with schema parsing in port_uri.rl

See #347

(Crash on rename index).

Do not invalidate a reference to key_def in alter space,
when preserving the old index.

Instead, update the old key def with new parameters.

See #347

See #347

Conflicts:
	doc/www-data.in/download.cmake