CMake minor cleanups.
Merge pull request #84 from murrekatt/develop

CMake minor cleanups.
Running unit tests as part of Travis builds.
Corrected version to same as in VERSION file.
Merge pull request #85 from murrekatt/develop

Running unit tests with Travis and cleanup of version and Travis file.
Moved RPM spec into package subdir.
Merge pull request #86 from murrekatt/develop

Moved RPM spec into package subdir.
cmake: Build with keyring option
Merge pull request #75 from lclc/keyrings

cmake: Build with keyring option
cmake: Build Doxygen documentation with "make doc"
Merge pull request #87 from lclc/doxygen

cmake: Build Doxygen documentation with "make doc"
style: replace each tab with 4 spaces

Command used:
    sed -i 's/\t/    /g' "$file"
clang-format: generate initial config

The configuration file was geneated (based on LLVM style)
by using the following command with clang-format 3.4:

    clang-format -dump-config > .clang-format
clang-format: adapt config to Monetas coding style
style: remove lines with comments containing dashed lines

Command used:
    sed -ri '/^ *\/\/ ?-+$/d' "$file"
style: remove comments containing dashed lines

Command used:
    sed -ri 's/^(.*[^\/])\/\/ ?-+$/\1/g' "$file"
style: remove comments with asterisk lines

Command used:
    sed -ri '/^ *\/\/ ?\*+$/d' "$file"
style: reformat code with clang-format
travis: add clang-format support
git: add pre-commit hook