Added autotools and libtool support
Checking if libm is needed
Fixing travis, tou sue autotools
Update gitignore to ignore autotools files
Adding support for pkg-config
Generate configure by running bootstrap.sh in travis
Ensure directory m4 exists before running autoreconf
We need "make check" instead of the default "make test"
In travis, build only the static library
Put auxiliary build tools into directory 'build-aux'
Update some configure macros
Add a m4 macro that defines major/minor/micro version in config.h
Add a draft with instructions to create a release
Require a minimum version of autoconf
Comment minimum autoconf, travis does not support it
Uncomment minimum autoconf macro, set to the version in Travis
Merge pull request #5 from sergiopasra/autotools

Add autotools, libtool and pkg-config support