Merge pull request qtumproject#460 from qtumproject/neil/bump-to-14.13

Bump version to 14.13

Merge pull request qtumproject#448 from qtumproject/earlz/v0.14.12

Bump to v0.14.12

Merge pull request qtumproject#437 from qtumproject/earlz/v0.14.11

Bump version to 0.14.11

Merge pull request qtumproject#428 from qtumproject/neil/update-leveldb

Neil/update leveldb