Actual libelliptics_module_backend_cpp.so moved from elliptics-dev to elliptics

Library was misplaced: it was included in elliptics-dev along with
versioned links to itself.
Merge pull request #166 from ijon/master

libelliptics_module_backend_cpp.so moved from elliptics-dev to elliptics
Merge pull request #165 from SaveTheRbtz/master

New eblob 0.21.0 API, metadata fixes, leveldb backend removal and recovery improvements.
v2.24.12.0