Fixes dependency reference to opentxs.

See commit 2e2a52fcc43987dac6ac5d3cb65865993fd754e8 in haarts/opentxs
Merge pull request #29 from haarts/fix_ubuntu_package_deps

Fixes dependency reference to opentxs.
Removed base library and adjusted building to use it from opentxs.
Merge pull request #30 from murrekatt/develop

Removed base library and adjusted building to use it from opentxs.
Updated build tar ball script to use opentxs-notary as name.
Merge pull request #31 from murrekatt/develop

Updated build tar ball script to use opentxs-notary as name.
clang-format-wrapper.sh: drop GNU sed dependency
Merge pull request #32 from toxeus/dropGSed

clang-format-wrapper.sh: drop GNU sed dependency
CMake: Use find_package() to find opentxs library