setup.py: use pkg-config to retrieve -I, -L, -l flags for libdnstable
setup.py: bump version to 0.4.0
Replace Python string formatting with calls to native code

Make the Python entry.to_json() and entry.to_text() methods thin
wrappers for dnstable_entry_to_json() and dnstable_entry_to_text().

In a libdnstable with the new dnstable_entry_set_iszone() function, the
native text and JSON format functions produce equivalent output to what
we were previously producing with the Python code, and the native
functions are much faster, of course.
Merge pull request #1 from farsightsec/branches/native-text-and-json

Replace Python string formatting with calls to native code
Remove unused C function 'fmt_time'
setup.py: Depend on libdnstable 0.7.0
Remove an extra newline
debian/gbp.conf: Switch to pristine-tar
Imported Upstream version 0.4.0
Merge tag 'upstream/0.4.0' into debian

Upstream version 0.4.0
debian/control: Update Maintainer, Standards-Version
debian/control: Build-Depend on libdnstable-dev >= 0.7.0
debian/control: Only build Python >= 2.7 modules
debian/control: Build-Depend on pkg-config
debian/changelog: 0.4.0-1